{"pageNumber":"273","pageRowStart":"6800","pageSize":"25","recordCount":10959,"records":[{"id":5777,"text":"pp1423A - 1999 - The Midwestern Basins and Arches regional aquifer system in parts of Indiana, Ohio, Michigan, and Illinois — Summary","interactions":[],"lastModifiedDate":"2021-12-15T20:15:20.579594","indexId":"pp1423A","displayToPublicDate":"2000-01-10T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1423","chapter":"A","title":"The Midwestern Basins and Arches regional aquifer system in parts of Indiana, Ohio, Michigan, and Illinois — Summary","docAbstract":"The Midwestern Basins and Arches aquifer system is composed of surficial deposits of Pleistocene and Holocene age and of Silurian and Devonian age carbonate rock in parts of Indiana, Illinois, Michigan, and Ohio. The study area encompasses a complex of structural arches--the Cincinnati, Findlay, and Kankakee arches--and it is bounded on the east, north, and west by the Appalachian, Michigan, and Illinois basins, respectively. This report describes the hydrogeologic framework, hydrology, and geochemistry of the Midwestern Basins and Arches.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Regional aquifer-system analysis - Midwestern Basins and Arches","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/pp1423A","usgsCitation":"Bugliosi, E.F., 1999, The Midwestern Basins and Arches regional aquifer system in parts of Indiana, Ohio, Michigan, and Illinois — Summary: U.S. Geological Survey Professional Paper 1423, vii, 46 p., https://doi.org/10.3133/pp1423A.","productDescription":"vii, 46 p.","costCenters":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"links":[{"id":392963,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_23173.htm"},{"id":32453,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/1423a/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":123200,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/pp/1423a/report-thumb.jpg"}],"country":"United States","state":"Illinois, Indiana, Michigan, Ohio","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -88.76953125,\n              38\n            ],\n            [\n              -81.267,\n              38\n            ],\n            [\n              -81.267,\n              42.47209690919285\n            ],\n            [\n              -88.76953125,\n              42.47209690919285\n            ],\n            [\n              -88.76953125,\n              38\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac8e4b07f02db67b8e6","contributors":{"authors":[{"text":"Bugliosi, Edward F. ebuglios@usgs.gov","contributorId":1083,"corporation":false,"usgs":true,"family":"Bugliosi","given":"Edward","email":"ebuglios@usgs.gov","middleInitial":"F.","affiliations":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"preferred":true,"id":151569,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":22605,"text":"ofr99399 - 1999 - Geometry, structure, and concealed lithology of the San Rafael Basin, southeastern Arizona","interactions":[],"lastModifiedDate":"2023-06-15T15:57:41.65603","indexId":"ofr99399","displayToPublicDate":"2000-01-10T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-399","title":"Geometry, structure, and concealed lithology of the San Rafael Basin, southeastern Arizona","docAbstract":"The contiguous United States has been well explored for exposed conventional mineral deposits. Therefore, it is likely that many economically viable and strategically significant conventional undiscovered mineral deposits will be found in bedrock concealed beneath basin sediments. Mineral resource assessments must incorporate an understanding of the geometry, structure, and concealed lithology of basins in order to be accurate. This report presents an analysis of the basin geometry and structure of the San Rafael basin in southeastern Arizona. In addition, a new methodology for inferring concealed lithology is presented and applied in the San Rafael basin.\n\nGravity data is used to model the geometry of the basin using recent models of sediment density vs. depth developed in the region. This modeling indicates that the basin has a maximum depth of approximately 1.05 km plus or minus 0.10 km. In the southern portion, the basin can be modeled as an asymmetric graben faulted on the western margin. The northern portion of the basin is structurally more complex and may have high angle faults on the western, northern, and eastern margin. Near-ground closely spaced Earth’s total intensity magnetic field data is used to locate concealed faults within the basin. This data is also used to infer lithology concealed by shallow basin sediments. Airborne Earth’s total intensity magnetic field data is used to help infer concealed lithology in deep portions of the basin. The product of integrating all data and interpretations is a map which presents the geometry of the basin, faults and contacts concealed by basin sediments, and an estimate of the bedrock lithology concealed by basin sediment.\n\nBased on basin geometry and concealed lithology, the San Rafael basin has a high potential for concealed mineral deposits on its western and northern margin. In particular, a newly discovered magnetic anomaly in the northern portion of the basin can be modeled as a granitic intrusion with highly altered margins and may represent a potential mineral resource target. Based on the permeability and porosity of upper basin fill found in nearby basins, the San Rafael basin may contain an aquifer up to 300 meters thick over a substantial area of the basin.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr99399","issn":"0094-9140","usgsCitation":"Bultman, M.W., 1999, Geometry, structure, and concealed lithology of the San Rafael Basin, southeastern Arizona (Version 1.0): U.S. Geological Survey Open-File Report 99-399, HTML document, https://doi.org/10.3133/ofr99399.","productDescription":"HTML document","onlineOnly":"Y","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":155840,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr99399.jpg"},{"id":284960,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0399/intro.html"},{"id":1370,"rank":3,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0399/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Arizona","otherGeospatial":"San Rafael Basin","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -111.25,31.5 ], [ -111.25,32.0 ], [ -110.25,32.0 ], [ -110.25,31.5 ], [ -111.25,31.5 ] ] ] } } ] }","edition":"Version 1.0","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd5e9be4b0b290850fbcd8","contributors":{"authors":[{"text":"Bultman, Mark W. 0000-0001-8352-101X mbultman@usgs.gov","orcid":"https://orcid.org/0000-0001-8352-101X","contributorId":3348,"corporation":false,"usgs":true,"family":"Bultman","given":"Mark","email":"mbultman@usgs.gov","middleInitial":"W.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":false,"id":188556,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":22622,"text":"ofr99380 - 1999 - Geophysical investigation of the nearshore geologic framework, eastern Casco Bay-Reid State Park, Maine: Data analysis and implications for Late Quaternary coastal evolution","interactions":[],"lastModifiedDate":"2021-11-16T20:56:13.649983","indexId":"ofr99380","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-380","title":"Geophysical investigation of the nearshore geologic framework, eastern Casco Bay-Reid State Park, Maine: Data analysis and implications for Late Quaternary coastal evolution","docAbstract":"<p>No abstract available.</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr99380","issn":"0094-9140","usgsCitation":"Buynevich, I., FitzGerald, D.M., and Parolski, K.F., 1999, Geophysical investigation of the nearshore geologic framework, eastern Casco Bay-Reid State Park, Maine: Data analysis and implications for Late Quaternary coastal evolution: U.S. Geological Survey Open-File Report 99-380, 32 p., https://doi.org/10.3133/ofr99380.","productDescription":"32 p.","costCenters":[],"links":[{"id":391765,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_19729.htm"},{"id":52093,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0380/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":155265,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0380/report-thumb.jpg"}],"country":"United States","state":"Maine","otherGeospatial":"Casco Bay-Reid State Park","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -69.903,\n              43.689\n            ],\n            [\n              -69.69,\n              43.689\n            ],\n            [\n              -69.69,\n              43.877\n            ],\n            [\n              -69.903,\n              43.877\n            ],\n            [\n              -69.903,\n              43.689\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac8e4b07f02db67c134","contributors":{"authors":[{"text":"Buynevich, I. V.","contributorId":96292,"corporation":false,"usgs":true,"family":"Buynevich","given":"I. V.","affiliations":[],"preferred":false,"id":188588,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"FitzGerald, D. M.","contributorId":55038,"corporation":false,"usgs":true,"family":"FitzGerald","given":"D.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":188587,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Parolski, K. F.","contributorId":99173,"corporation":false,"usgs":true,"family":"Parolski","given":"K.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":188589,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70260453,"text":"70260453 - 1999 - Evaluation of weights of evidence to predict epithermal-gold deposits in the Great Basin of the western United States","interactions":[],"lastModifiedDate":"2024-11-01T16:37:47.092931","indexId":"70260453","displayToPublicDate":"1999-12-01T11:32:32","publicationYear":"1999","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2832,"text":"Natural Resources Research","onlineIssn":"1573-8981","printIssn":"1520-7439","active":true,"publicationSubtype":{"id":10}},"title":"Evaluation of weights of evidence to predict epithermal-gold deposits in the Great Basin of the western United States","docAbstract":"<p><span>The weights-of-evidence method provides a simple approach to the integration of diverse geologic information. The application addressed is to construct a model that predicts the locations of epithermal-gold mineral deposits in the Great Basin of the western United States. Weights of evidence is a data-driven method requiring known deposits and occurrences that are used as training sites in the evaluated area. Four hundred and fifteen known hot spring gold–silver, Comstock vein, hot spring mercury, epithermal manganese, and volcanogenic uranium deposits and occurrences in Nevada were used to define an area of 327.4 km</span><sup>2</sup><span>&nbsp;as training sites to develop the model. The model consists of nine weighted-map patterns that are combined to produce a favorability map predicting the distribution of epithermal-gold deposits. Using a measure of the association of training sites with predictor features (or patterns), the patterns can be ranked from best to worst predictors. Based on proximity analysis, the strongest predictor is the area within 8 km of volcanic rocks younger than 43 Ma. Being close to volcanic rocks is not highly weighted, but being far from volcanic rocks causes a strong negative weight. These weights suggest that proximity to volcanic rocks define where deposits do not occur. The second best pattern is the area within 1 km of hydrothermally altered areas. The next best pattern is the area within 1 km of known placer-gold sites. The proximity analysis for gold placers weights this pattern as useful when close to known placer sites, but unimportant where placers do not exist. The remaining patterns are significantly weaker predictors. In order of decreasing correlation, they are: proximity to volcanic vents, proximity to east-west to northwest faults, elevated airborne radiometric uranium, proximity to northwest to west and north-northwest linear features, elevated aeromagnetics, and anomalous geochemistry. This ordering of the patterns is a function of the quality, applicability, and use of the data. The nine-pattern favorability map can be evaluated by comparison with the USGS National Assessment for hot spring gold–silver deposits. The Spearman's ranked correlation coefficient between the favorability and the National Assessment permissive tracts is 0.5. Tabulations of the areas of agreement and disagreement between the two maps show 74% agreement for the Great Basin. The posterior probabilities for 51 significant deposits in the Great Basin, both used and not used in the model, show the following: 26 classified as favorable; 25 classified as permissive; and 1, Florida Canyon, classified as nonpermissive.The Florida Canyon deposit has a low favorability because there are no volcanic rocks near the deposit on the Nevada geologic map used. The largest areas of disagreement are caused by the USGS National Assessment team concluding that volcanic rocks older than 27 Ma in Nevada are not permissive, which was not assumed in this model. The weights-of-evidence model is evaluated as reasonable and delineates permissive areas for epithermal deposits comparable to expert's delineation. The weights-of-evidence model has the additional characteristics that it is well defined, reproducible, objective, and provides a quantitative measure of confidence.</span></p>","language":"English","publisher":"Springer Nature","doi":"10.1023/A:1021602316101","usgsCitation":"Raines, G.L., 1999, Evaluation of weights of evidence to predict epithermal-gold deposits in the Great Basin of the western United States: Natural Resources Research, v. 8, p. 257-276, https://doi.org/10.1023/A:1021602316101.","productDescription":"20 p.","startPage":"257","endPage":"276","costCenters":[],"links":[{"id":463551,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California, Nevada","otherGeospatial":"Great Basin","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -116.17371584886055,\n              36.273382491792404\n            ],\n            [\n              -114.04169884465318,\n              36.75188401988002\n            ],\n            [\n              -114.03910682052589,\n              42.01392037172616\n            ],\n            [\n              -120.09328767290734,\n              41.95091532528593\n            ],\n            [\n              -120.3038484479028,\n              39.282649293195846\n            ],\n            [\n              -116.17371584886055,\n              36.273382491792404\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      }\n    }\n  ]\n}","volume":"8","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Raines, Gary L.","contributorId":48162,"corporation":false,"usgs":true,"family":"Raines","given":"Gary","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":917725,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":21807,"text":"ofr99341 - 1999 - Geochemistry of stream-sediment samples from the Santa Renia Fields and Beaver Peak quadrangles, northern Carlin Trend, Nevada","interactions":[],"lastModifiedDate":"2023-06-15T15:36:25.210024","indexId":"ofr99341","displayToPublicDate":"1999-12-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-341","title":"Geochemistry of stream-sediment samples from the Santa Renia Fields and Beaver Peak quadrangles, northern Carlin Trend, Nevada","docAbstract":"A broad west-to-east increase of many metal concentrations has been found in stream sediments during a reconnaissance investigation conducted in conjunction with geologic studies in the Santa Renia Fields and Beaver Peak 7–1/2 minute quadrangles near the northern end of the Carlin trend of gold deposits in the Tuscarora Mountains. This regional increase in metal concentrations coincides with a dramatic change in landform wherein high concentrations of metals in stream sediments appear to correlate directly with areas of high elevations and steep slopes in the Beaver Peak quadrangle. Robust erosion combined with high flow rates in streams from these higher elevations are envisaged to have contributed significantly to increased metal concentrations in the stream sediments by an enhanced presence of minerals with high specific gravities and a correspondingly diminished presence of minerals with low specific gravities. Minerals with low specific gravities probably have been preferentially flushed down stream because of high transporting capacities for sediment by streams in the Beaver Peak quadrangle. In addition, the Carlin trend, a generally northwest-alignment of gold deposits in the Santa Renia Fields quadrangle, is well outlined by arsenic concentrations that include a maximum of approximately 54 parts per million. Further, a weakly developed distal-to-proximal metal zonation towards these gold deposits appears to be defined respectively in plots showing distributions of thallium, arsenic, antimony, and zinc. A broad area of high metal concentrations—including sharply elevated abundances of Ag, As, Au, Cd, Co, Cu, Mn, Ni, P, Sb, Sc, Te, V, and especially Zn—near the southeast corner of the Beaver Peak quadrangle primarily could be the result of stratiform mineralized rocks in the Ordovician Vinini Formation or Devonian Slaven Chert, or the result of a subsequent Mesozoic or Tertiary epigenetic overprint.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr99341","issn":"0566-8174","usgsCitation":"Theodore, T., Kotlyar, B.B., Berger, V.I., Moring, B.C., Singer, D.A., and Edstrom, S.A., 1999, Geochemistry of stream-sediment samples from the Santa Renia Fields and Beaver Peak quadrangles, northern Carlin Trend, Nevada: U.S. Geological Survey Open-File Report 99-341, Report: iv, 105 p.; Data: XLS; Data only: PDF, https://doi.org/10.3133/ofr99341.","productDescription":"Report: iv, 105 p.; Data: XLS; Data only: PDF","numberOfPages":"109","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":153975,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0341/report-thumb.jpg"},{"id":1227,"rank":4,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0341/","linkFileType":{"id":5,"text":"html"}},{"id":284893,"rank":2,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0341/pdf/SRF_BPGeochem.pdf"},{"id":284892,"rank":3,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0341/SRF_BPGeochem.xls"},{"id":51299,"rank":5,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0341/pdf/OF99-341.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Nevada","otherGeospatial":"Beaver Peak, Santa Reina Fields","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -116.5,41.0 ], [ -116.5,41.125 ], [ -116.25,41.125 ], [ -116.25,41.0 ], [ -116.5,41.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd5b08e4b0b290850f9c00","contributors":{"authors":[{"text":"Theodore, Ted G.","contributorId":57840,"corporation":false,"usgs":true,"family":"Theodore","given":"Ted G.","affiliations":[],"preferred":false,"id":185773,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kotlyar, Boris B.","contributorId":35376,"corporation":false,"usgs":true,"family":"Kotlyar","given":"Boris","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":185771,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Berger, Vladimir I.","contributorId":15246,"corporation":false,"usgs":true,"family":"Berger","given":"Vladimir","email":"","middleInitial":"I.","affiliations":[],"preferred":false,"id":185770,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Moring, Barry C. 0000-0001-6797-9258 moring@usgs.gov","orcid":"https://orcid.org/0000-0001-6797-9258","contributorId":2794,"corporation":false,"usgs":true,"family":"Moring","given":"Barry","email":"moring@usgs.gov","middleInitial":"C.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":185768,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Singer, Donald A. dsinger@usgs.gov","contributorId":5601,"corporation":false,"usgs":true,"family":"Singer","given":"Donald","email":"dsinger@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":185769,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Edstrom, Sven A.","contributorId":50816,"corporation":false,"usgs":true,"family":"Edstrom","given":"Sven","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":185772,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":22209,"text":"ofr99301 - 1999 - Tertiary coals in South Texas: Anomalous cannel-like coals of Webb County (Claiborne Group, Eocene) and lignites of Atascosa County (Jackson Group, Eocene) - Geologic setting, character, source-rock and coal-bed methane potential","interactions":[],"lastModifiedDate":"2018-02-01T12:49:08","indexId":"ofr99301","displayToPublicDate":"1999-12-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-301","title":"Tertiary coals in South Texas: Anomalous cannel-like coals of Webb County (Claiborne Group, Eocene) and lignites of Atascosa County (Jackson Group, Eocene) - Geologic setting, character, source-rock and coal-bed methane potential","docAbstract":"<p>The coal-bearing Gulf of Mexico Coastal Plain of North America contains a variety of depositional settings and coal types. The coal-bearing region extends westward from Alabama and Mississippi, across Louisiana to the northern part of the Mississippi Embayment, and then southward to eastern Arkansas, Texas and northern Mexico (fig. 1). Most of the coal currently mined in Texas is lignite from the upper part of the Wilcox Group (Paleocene-Eocene) and, in Louisiana, lignite is mined from the lower part of the Wilcox (fig. 2). Gulf Coast coal is used primarily as fuel for mine-mouth electric plants. On this field trip we will visit the only two non-Wilcox coal mining intervals in the Texas-Louisiana Coastal Plain; these include the San Pedro - Santo Tomas bituminous cannel-like coal zone of the Eocene Claiborne Group, and the San Miguel lignite coal zone of the Eocene Jackson Group (fig. 2). Other coal-mining areas in northern Mexico are currently producing bituminous coal from the Cretaceous Olmos Formation of the Navaro Group (fig. 2).</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr99301","issn":"0094-9140","usgsCitation":"1999, Tertiary coals in South Texas: Anomalous cannel-like coals of Webb County (Claiborne Group, Eocene) and lignites of Atascosa County (Jackson Group, Eocene) - Geologic setting, character, source-rock and coal-bed methane potential: U.S. Geological Survey Open-File Report 99-301, vi, 47 p., https://doi.org/10.3133/ofr99301.","productDescription":"vi, 47 p.","costCenters":[],"links":[{"id":155601,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":1547,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/pdf/of/ofr99301","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Texas","county":"Atascosa County, Webb 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,{"id":23096,"text":"ofr99360 - 1999 - Cruise report; RV Coastal Surveyor Cruise C1-99; multibeam mapping of the Long Beach, California continental shelf; April 12 through May 19, 1999","interactions":[],"lastModifiedDate":"2014-03-25T13:53:46","indexId":"ofr99360","displayToPublicDate":"1999-12-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-360","title":"Cruise report; RV Coastal Surveyor Cruise C1-99; multibeam mapping of the Long Beach, California continental shelf; April 12 through May 19, 1999","docAbstract":"The greater Los Angeles area of California is home to more than 10 million people. This large population puts increased pressure on the adjacent offshore continental shelf and margin with activities such as ocean disposal for dredged spoils, explosive disposal, waste-water outfall, and commercial fishing. The increased utilization of the shelf and margin in this area has generated accelerated multi-disciplinary research efforts in all aspects of the environment of the coastal zone. Prior to 1996 there were no highly accurate base maps of the continental shelf and slope upon which the research activities could be located and monitored. In 1996, the United States Geological Survey (USGS) Pacific Seafloor Mapping Project began to address this problem by mapping the Santa Monica shelf and margin (Fig. 1) using a state-of-the-art, high-resolution multibeam sonar system (Gardner, et al., 1996; 1999). Additional seafloor mapping in 1998 provided coverage of the continental margin from south of Newport to the proximal San Pedro Basin northwest of Palos Verdes Peninsula (Gardner, et al., 1998) (Fig. 1). The mapping of the seafloor in the greater Los Angeles continental shelf and margin was completed with a 30-day mapping of the Long Beach shelf in April and May 1999, the subject of this report. The objective of Cruise C-1-99-SC was to completely map the broad continental shelf from the eastern end of the Palos Verdes Peninsula to the narrow shelf south of Newport Beach, from the break in slope at about 120-m isobath to the inner shelf at about the 10-m isobath. Mapping the Long Beach shelf was jointly funded by the U.S. Geological Survey and the County of Orange (CA) Sanitation District and was conducted under a Cooperative Agreement with the Ocean Mapping Group from the University of New Brunswick (OMG/UNB). The OMG/UNB contracted with C&C Technologies, Inc. of Lafayette, LA for use of the RV Coastal Surveyor and the latest evolution of high-resolution multibeam sonars, a dual Kongsberg Simrad EM3000D.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr99360","issn":"0094-9140","collaboration":"Conducted under a Cooperative Agreement between the US Geological Survey and the Ocean Mapping Group, University of New Brunswick","usgsCitation":"Gardner, J.V., Hughes Clarke, J.E., and Mayer, L.A., 1999, Cruise report; RV Coastal Surveyor Cruise C1-99; multibeam mapping of the Long Beach, California continental shelf; April 12 through May 19, 1999: U.S. Geological Survey Open-File Report 99-360, HTML document, https://doi.org/10.3133/ofr99360.","productDescription":"HTML document","onlineOnly":"Y","temporalStart":"1999-04-12","temporalEnd":"1999-05-19","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":1512,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0360/","linkFileType":{"id":5,"text":"html"}},{"id":156004,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0360/report-thumb.jpg"},{"id":52464,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0360/intro.html","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"California","otherGeospatial":"Long Beach","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -118.313511,33.582474 ], [ -118.313511,33.862655 ], [ -117.835287,33.862655 ], [ -117.835287,33.582474 ], [ -118.313511,33.582474 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd537fe4b0b290850f5302","contributors":{"authors":[{"text":"Gardner, James V.","contributorId":93035,"corporation":false,"usgs":true,"family":"Gardner","given":"James","email":"","middleInitial":"V.","affiliations":[],"preferred":false,"id":189428,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hughes Clarke, John E.","contributorId":58676,"corporation":false,"usgs":false,"family":"Hughes Clarke","given":"John","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":189426,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mayer, Larry A.","contributorId":69583,"corporation":false,"usgs":true,"family":"Mayer","given":"Larry","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":189427,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":63100,"text":"gq1804 - 1999 - Geologic map of the Allentown East quadrangle, Lehigh, Northampton, and Bucks Counties, Pennsylvania","interactions":[],"lastModifiedDate":"2021-11-10T20:24:08.682653","indexId":"gq1804","displayToPublicDate":"1999-12-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":316,"text":"Geologic Quadrangle","code":"GQ","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1804","title":"Geologic map of the Allentown East quadrangle, Lehigh, Northampton, and Bucks Counties, Pennsylvania","docAbstract":"<p>No abstract available.</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/gq1804","usgsCitation":"Drake, A., 1999, Geologic map of the Allentown East quadrangle, Lehigh, Northampton, and Bucks Counties, Pennsylvania: U.S. Geological Survey Geologic Quadrangle 1804, Report: 1 p.; Plate, https://doi.org/10.3133/gq1804.","productDescription":"Report: 1 p.; Plate","costCenters":[],"links":[{"id":109891,"rank":700,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_23017.htm","linkFileType":{"id":5,"text":"html"},"description":"23017"},{"id":249226,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gq/1804/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":252391,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gq/1804/report-thumb.jpg"}],"scale":"24000","country":"United States","state":"Pennsylvania","county":"Bucks County, Lehigh County, Northampton County","otherGeospatial":"Allentown East quadrangle","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -75.5,40.5 ], [ -75.5,40.625 ], [ -75.375,40.625 ], [ -75.375,40.5 ], [ -75.5,40.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b12e4b07f02db6a24aa","contributors":{"authors":[{"text":"Drake, Avery Jr.","contributorId":62582,"corporation":false,"usgs":true,"family":"Drake","given":"Avery","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":268330,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
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,{"id":22259,"text":"ofr99202 - 1999 - Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data","interactions":[],"lastModifiedDate":"2016-03-28T14:34:52","indexId":"ofr99202","displayToPublicDate":"1999-11-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-202","title":"Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data","docAbstract":"<p><span>Water-chemistry, biological, and habitat data were collected from 70 sites on Midwestern streams during August 1997 as part of an integrated, regional water-quality assessment by the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. The study area includes the Corn Belt region of southern Minnesota, eastern Iowa, and west-central Illinois, one of the most intensive and productive agricultural regions of the world. The focus of the study was to evaluate the condition of woodedriparian zones and the influence of basin soildrainage characteristics on water quality and biological-community responses. This report includes a description of the study design and site-characterization process, sample-collection and processing methods, laboratory methods, quality-assurance procedures, and summaries of data on nutrients, herbicides and metabolites, stream productivity and respiration, biological communities, habitat conditions, and agriculturalchemical and land-use information.</span></p>","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Denver, CO","doi":"10.3133/ofr99202","issn":"0094-9140","usgsCitation":"Sorenson, S.K., Porter, S.D., Akers, K., Harris, M., Kalkhoff, S., Lee, K.E., Roberts, L., and Terrio, P.J., 1999, Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data: U.S. Geological Survey Open-File Report 99-202, iv, 53 p., https://doi.org/10.3133/ofr99202.","productDescription":"iv, 53 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,{"id":23774,"text":"ofr99199 - 1999 - Estimated hydraulic properties for the surficial- and bedrock-aquifer system, Meddybemps, Maine","interactions":[],"lastModifiedDate":"2022-01-31T21:16:51.486933","indexId":"ofr99199","displayToPublicDate":"1999-11-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-199","title":"Estimated hydraulic properties for the surficial- and bedrock-aquifer system, Meddybemps, Maine","docAbstract":"Analytical and numerical-modeling methods were used to estimate hydraulic properties of the aquifer system underlying the Eastern Surplus Company Superfund Site in Meddybemps, Maine. Estimates of hydraulic properties are needed to evaluate pathways for contaminants in ground water and to support evaluation and selection of remediation measures for contaminated ground water at this site. \r\n\r\n\r\nThe hydraulic conductivity of surficial materials, determined from specific-capacity tests, ranges from 17 to 78 feet per day for wells completed in coarse-grained glaciomarine sediments, and from about 0.1 to 1.Ofoot per day for wells completed in till. The transmissivity of fractured bedrock determined from specific-capacity tests and aquifer tests in wells completed in less than 200 feet of bedrock ranges from about 0.09 to 130 feet squared per day. Relatively high values of transmissivity at the south end of the study area appear to be associated with a high-angle fracture or fracture zone that hydraulically connects two wells completed in bedrock. Transmissivities at six low-yielding (less than 0.5 gallon per minute) wells, which appear to lie within a poorly transmissive block of the bedrock, are consistently in a range of about 0.09 to 0.5 foot squared per day.\r\n\r\n\r\nThe estimates of hydraulic conductivity and transmissivity in the southern half of the study area are supported by results of steady-state calibration of a numerical model and simulation of a 24-hour pumping test at a well completed in bedrock. Hydraulic conductivity values for the surficial aquifer used in the model were 30 feet per day for coarse-grained glaciomarine sediments, 0.001 to 0.01 foot per day for fine-grained glaciomarine sediments, and 0.1 to 0.5 foot per day for till. As part of model calibration, a relatively transmissive zone in the surficial aquifer was extended beyond the hypothesized extent of coarse-grained sediments eastward to the Dennys River.\r\n\r\n\r\nHydraulic conductivity values used for bedrock in the model ranged from 3x10-4 to 1.5 feet per day. The highest values were in the fracture zone that hydraulically connects two wells and apparently extends to the Dennys River. The transmissivity of bedrock used in the model ranged from 0.03 to 150 feet squared per day, with the majority of the bedrock transmissivities set at 0.3 foot squared per day. Numerical modeling results indicated that a very low ratio of vertical hydraulic conductivity to thickness (1x10-9 days-l) was required to simulate a persistent cone of depression near a residential well that lies in the previously identified poorly transmissive block of bedrock.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr99199","issn":"0094-9140","usgsCitation":"Lyford, F.P., Garabedian, S.P., and Hansen, B.P., 1999, Estimated hydraulic properties for the surficial- and bedrock-aquifer system, Meddybemps, Maine: U.S. Geological Survey Open-File Report 99-199, iv, 27 p., https://doi.org/10.3133/ofr99199.","productDescription":"iv, 27 p.","costCenters":[],"links":[{"id":157455,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":395187,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_19454.htm"},{"id":1780,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.water.usgs.gov/ofr99199/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Maine","city":"Meddybumps","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -67.3626708984375,\n              45.03371396774147\n            ],\n            [\n              -67.35189914703369,\n              45.03371396774147\n            ],\n            [\n              -67.35189914703369,\n              45.042174817839786\n            ],\n            [\n              -67.3626708984375,\n              45.042174817839786\n            ],\n            [\n              -67.3626708984375,\n              45.03371396774147\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a0ce4b07f02db5fcd6d","contributors":{"authors":[{"text":"Lyford, Forest P.","contributorId":43334,"corporation":false,"usgs":true,"family":"Lyford","given":"Forest","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":190699,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Garabedian, Stephen P.","contributorId":91090,"corporation":false,"usgs":true,"family":"Garabedian","given":"Stephen","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":190701,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hansen, Bruce P.","contributorId":90727,"corporation":false,"usgs":true,"family":"Hansen","given":"Bruce","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":190700,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":21848,"text":"ofr99303 - 1999 - Gravity and magnetic study of the Pahute Mesa and Oasis Valley region, Nye County, Nevada","interactions":[],"lastModifiedDate":"2023-06-15T15:34:31.955449","indexId":"ofr99303","displayToPublicDate":"1999-11-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-303","title":"Gravity and magnetic study of the Pahute Mesa and Oasis Valley region, Nye County, Nevada","docAbstract":"Regional gravity and aeromagnetic maps reveal the existence of deep basins underlying much of the southwestern Nevada volcanic field, approximately 150 km northwest of Las Vegas. These maps also indicate the presence of prominent features (geophysical lineaments) within and beneath the basin fill. Detailed gravity surveys were conducted in order to characterize the nature of the basin boundaries, delineate additional subsurface features, and evaluate their possible influence on the movement of ground-water. Geophysical modeling of gravity and aeromagnetic data indicates that many of the features may be related to processes of caldera formation. Collapse of the various calderas within the volcanic field resulted in dense basement rocks occurring at greater depths within caldera boundaries. Modeling indicates that collapse occurred along faults that are arcuate and steeply dipping. There are indications that the basement in the western Pahute Mesa - Oasis Valley region consists predominantly of granitic and/or fine-grained siliceous sedimentary rocks that may be less permeable to groundwater flow than the predominantly fractured carbonate rock basement to the east and southeast of the study area. The northeast-trending Thirsty Canyon lineament, expressed on gravity and basin thickness maps, separates dense volcanic rocks on the northwest from less dense intracaldera accumulations in the Silent Canyon and Timber Mountain caldera complexes. The source of the lineament is an approximately 2-km wide ring fracture system with step-like differential displacements, perhaps localized on a pre-existing northeast-trending Basin and Range fault. Due to vertical offsets, the Thirsty Canyon fault zone probably juxtaposes rock types of different permeability and, thus, it may act as a barrier to ground-water flow and deflect flow from Pahute Mesa along its flanks toward Oasis Valley. Within the Thirsty Canyon fault zone, highly fractured rocks may serve also as a conduit, depending upon the degree of alteration and its effect on porosity and permeability. In the Oasis Valley region, other structures that may influence ground-water flow include the western and southern boundaries of the Oasis Valley basin, where the basement abruptly shallows.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr99303","issn":"0566-8174","collaboration":"Prepared in cooperation with the U.S. Department of Energy Nevada Operations Office (Interagency Agreement DE-AI08-96NV11967)","usgsCitation":"Mankinen, E.A., Hildenbrand, T.G., Dixon, G.L., McKee, E.H., Fridrich, C.J., and Laczniak, R.J., 1999, Gravity and magnetic study of the Pahute Mesa and Oasis Valley region, Nye County, Nevada: U.S. Geological Survey Open-File Report 99-303, 58 p., https://doi.org/10.3133/ofr99303.","productDescription":"58 p.","additionalOnlineFiles":"N","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":51332,"rank":3,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0303/pdf/of99-303.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":153182,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0303/report-thumb.jpg"},{"id":1241,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0303/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Nevada","county":"Nye County","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -118.1972,35.9618 ], [ -118.1972,39.1634 ], [ -114.999,39.1634 ], [ -114.999,35.9618 ], [ -118.1972,35.9618 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd5f18e4b0b290850fc1db","contributors":{"authors":[{"text":"Mankinen, Edward A. 0000-0001-7496-2681 emank@usgs.gov","orcid":"https://orcid.org/0000-0001-7496-2681","contributorId":1054,"corporation":false,"usgs":true,"family":"Mankinen","given":"Edward","email":"emank@usgs.gov","middleInitial":"A.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":185954,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hildenbrand, Thomas G.","contributorId":61787,"corporation":false,"usgs":true,"family":"Hildenbrand","given":"Thomas","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":185958,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dixon, Gary L.","contributorId":23571,"corporation":false,"usgs":true,"family":"Dixon","given":"Gary","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":185957,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"McKee, Edwin H. mckee@usgs.gov","contributorId":3728,"corporation":false,"usgs":true,"family":"McKee","given":"Edwin","email":"mckee@usgs.gov","middleInitial":"H.","affiliations":[],"preferred":true,"id":185956,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Fridrich, Christopher J. 0000-0003-2453-6478 fridrich@usgs.gov","orcid":"https://orcid.org/0000-0003-2453-6478","contributorId":1251,"corporation":false,"usgs":true,"family":"Fridrich","given":"Christopher","email":"fridrich@usgs.gov","middleInitial":"J.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":185955,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Laczniak, Randell J.","contributorId":90687,"corporation":false,"usgs":true,"family":"Laczniak","given":"Randell","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":185959,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70168699,"text":"70168699 - 1999 - Groundwater geochemistry in the Seminole Well Field, Cedar Rapids, Iowa","interactions":[],"lastModifiedDate":"2019-12-14T06:19:34","indexId":"70168699","displayToPublicDate":"1999-10-01T16:45:00","publicationYear":"1999","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2529,"text":"Journal of the American Water Resources Association","active":true,"publicationSubtype":{"id":10}},"title":"Groundwater geochemistry in the Seminole Well Field, Cedar Rapids, Iowa","docAbstract":"<p>The City of Cedar Rapids obtains its municipal water supply from four well fields in an alluvial aquifer along the Cedar River in east-central Iowa. Since 1992, the City and the U.S. Geological Survey have cooperatively studied the groundwater-flow system and water chemistry near the well fields. The geochemistry in the alluvial aquifer near the Seminole Well Field was assessed to identify potentially reactive minerals and possible chemical reactions that produce observed changes in water chemistry. Calcite, dolomite, ferrihydrite, quartz, rhodochrosite, and siderite were identified as potentially reactive minerals by calculating saturation indexes. Aluminosiicate minerals including albite, Ca-montmorillonite, gibbsite, illite, K-feldspar, and kaolinite were identified as potentially reactive minerals using hypothetical saturation indexes calculated with an assumed dissolved aluminum concentration of 1 microgram per liter. Balanced chemical equations derived from inverse-modeling techniques were used to assess chemical reactions as precipitation percolates to the water table. Calcite dissolution was predominate, but aluminosilicate weathering, cation exchange, and redox reactions also likely occurred. Microbial-catalyzed redox reactions altered the chemical composition of water infiltrating from the Cedar River into the alluvial aquifer by consuming dissolved oxygen, reducing nitrate, and increasing dissolved iron and manganese concentrations. Nitrate reduction only occurred in relatively shallow (3 to 7 meters below land surface) groundwater near the Cedar River and did not occur in water infiltrating to deeper zones of the alluvial aquifer.</p>","language":"English","publisher":"American Water Resources Association","doi":"10.1111/j.1752-1688.1999.tb04212.x","usgsCitation":"Boyd, R., 1999, Groundwater geochemistry in the Seminole Well Field, Cedar Rapids, Iowa: Journal of the American Water Resources Association, v. 35, no. 5, p. 1257-1268, https://doi.org/10.1111/j.1752-1688.1999.tb04212.x.","productDescription":"12 p.","startPage":"1257","endPage":"1268","numberOfPages":"12","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true}],"links":[{"id":318371,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Iowa","city":"Cedar Rapids","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -91.8017578125,\n              41.90432124806034\n            ],\n            [\n              -91.55731201171875,\n              41.90432124806034\n            ],\n            [\n              -91.55731201171875,\n              42.049292638686836\n            ],\n            [\n              -91.8017578125,\n              42.049292638686836\n            ],\n            [\n              -91.8017578125,\n              41.90432124806034\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"35","issue":"5","noUsgsAuthors":false,"publicationDate":"2007-06-08","publicationStatus":"PW","scienceBaseUri":"56cee265e4b015c306ec5ed4","contributors":{"authors":[{"text":"Boyd, Robert A.","contributorId":16491,"corporation":false,"usgs":true,"family":"Boyd","given":"Robert A.","affiliations":[],"preferred":false,"id":621324,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70021282,"text":"70021282 - 1999 - An in situ occurrence of coal balls in the Amburgy coal bed, Pikeville Formation (Duckmantian), central Appalachian Basin, USA","interactions":[],"lastModifiedDate":"2025-03-11T16:25:36.548973","indexId":"70021282","displayToPublicDate":"1999-10-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3000,"text":"Palaios","active":true,"publicationSubtype":{"id":10}},"title":"An in situ occurrence of coal balls in the Amburgy coal bed, Pikeville Formation (Duckmantian), central Appalachian Basin, USA","docAbstract":"Carbonate concretions containing permineralized peat, commonly called coal balls, were encountered in the Amburgy coal, a generally low-ash (9.4%), but commonly high-sulfur (3.6%), Middle Pennsylvanian coal of the Eastern Kentucky Coal Field. These are the first coal balls from the Amburgy coal, and one of only a few reported occurrences from the central Appalachian Basin. The coal balls occur in the upper part of the coal, between two paleochannel cut-outs at the top of the Pikeville Formation, and immediately beneath a scour with a marine fossil lag at the base of the Kendrick Shale Member, Hyden Formation. The coal is thickest (1.3 m) in a narrow (<300 m), elongate depression between the bounding paleochannels, and thins toward the occurrence of coal balls. Total biovolume as measured from acetate peels of coal balls indicates cordaites or lycopsid (36.1% each) dominance. Vertical sampling through one coal-ball aggregate shows zoning from a lower cordaites-dominant (88.7%) assemblage, to a middle, degraded, sphenopsid-rich assemblage, to an upper lycopsid-dominant (88.6%) assemblage. Beneath the coal balls, palynologic and petrographic analyses indicate the basal and middle portions of the bed are dominated by arborescent lycopsid spores and cordaites pollen, and by vitrinite macerals. The top part of the bed, above the coal balls, contains increased intertinite macerals, increased percentages of small fern spores, and variable ash yield (5-21%). Thickening of the Amburgy coal along a structural low, in combination with basal high-ash yields, vitrinite-dominance, and heterogenous palynoflora, indicate paleotopographic control on initial peat accumulation. Abundant lycopsid spores in the basal and middle part of the coal reflect rheotrophic conditions consistent with accumulation in a paleotopographic depression. Apparent zonation preserved in one of the coal-ball masses may document plant successions in response to flooding. Similar percentages of cordaites and lycopods, respectively, in the zones above and below the degraded incursion interval reflect development of a mixed, successional pattern in response to the flooding. Coal-ball formation may have been facilitated by channeling along the Kendrick ravinement, within a paleotopographic depression, at the split margin of the Amburgy peat, either through direct transmittal of carbonates and marine waters into the peat, or through degassing of the peat beneath the scour.","language":"English","publisher":"GeoScienceWorld","doi":"10.2307/3515395","usgsCitation":"Greb, S.F., Eble, C.F., Chesnut, D., Phillips, T., and Hower, J., 1999, An in situ occurrence of coal balls in the Amburgy coal bed, Pikeville Formation (Duckmantian), central Appalachian Basin, USA: Palaios, v. 14, no. 5, p. 432-450, https://doi.org/10.2307/3515395.","productDescription":"19 p.","startPage":"432","endPage":"450","costCenters":[],"links":[{"id":229904,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Kentucky","otherGeospatial":"eastern Kentucky","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -83.69980257547141,\n              38.70214789921263\n            ],\n            [\n              -83.84300270599691,\n              37.75876408313333\n            ],\n            [\n              -83.69980257547141,\n              36.80029100301837\n            ],\n            [\n              -83.70457039308808,\n              36.64685681780912\n            ],\n            [\n              -83.17474214453055,\n              36.75365616083732\n            ],\n            [\n              -82.03874357522238,\n              37.44691270572568\n            ],\n            [\n              -82.59245790499662,\n              38.15332014901537\n            ],\n            [\n              -82.60201726667941,\n              38.47631209262711\n            ],\n            [\n              -82.8216005215753,\n              38.72450440106374\n            ],\n            [\n              -83.27024802949818,\n              38.66862072995167\n            ],\n            [\n              -83.69980257547141,\n              38.70214789921263\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      },\n      \"id\": 0\n    }\n  ]\n}","volume":"14","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ea74e4b0c8380cd4888f","contributors":{"authors":[{"text":"Greb, Stephen F.","contributorId":255517,"corporation":false,"usgs":false,"family":"Greb","given":"Stephen","email":"","middleInitial":"F.","affiliations":[{"id":51568,"text":"Kentucky Geological Survey, U. of Kentucky","active":true,"usgs":false}],"preferred":false,"id":389338,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Eble, Cortland F.","contributorId":255518,"corporation":false,"usgs":false,"family":"Eble","given":"Cortland","email":"","middleInitial":"F.","affiliations":[{"id":51568,"text":"Kentucky Geological Survey, U. of Kentucky","active":true,"usgs":false}],"preferred":false,"id":389336,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Chesnut, D.R. Jr.","contributorId":100548,"corporation":false,"usgs":true,"family":"Chesnut","given":"D.R.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":389340,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Phillips, T.L.","contributorId":43517,"corporation":false,"usgs":true,"family":"Phillips","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":389337,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hower, James C. 0000-0003-4694-2776","orcid":"https://orcid.org/0000-0003-4694-2776","contributorId":34561,"corporation":false,"usgs":false,"family":"Hower","given":"James C.","affiliations":[{"id":16123,"text":"University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, United States.","active":true,"usgs":false}],"preferred":false,"id":389339,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":24022,"text":"ofr99170 - 1999 - Geochemical investigations and interim recommendations for priority abandoned mine sites on U.S.D.A. Forest Service lands, Mineral Creek watershed, San Juan County, Colorado","interactions":[],"lastModifiedDate":"2022-09-01T19:09:56.658793","indexId":"ofr99170","displayToPublicDate":"1999-10-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-170","title":"Geochemical investigations and interim recommendations for priority abandoned mine sites on U.S.D.A. Forest Service lands, Mineral Creek watershed, San Juan County, Colorado","docAbstract":"Field observations, sampling of mine dumps and mine drainage waters, and\r\nlaboratory studies of dump materials have been made at mining areas deemed to be on\r\npublic lands administered by the USDA Forest Service in the Mineral Creek watershed.\r\nResults of chemical analyses of dump materials, leachates of those materials, and of\r\nsurface waters draining mines or dumps provide indications of where acid is generated or\r\nconsumed, and what metals are mobilized below mines or dumps. Information on 25\r\nsites is reviewed and reclamation priorities are ranked into four classes (high, medium,\r\nlow priority, or no work required).\r\nThe western side of the upper Animas watershed (the Mineral Creek watershed)\r\nhas a history of mining and prospecting for about 130 years. The intensity of miningrelated\r\ndisturbance is higher than in most parts of the San Juan Mountains region, but\r\nactually is much less than the eastern half of the watershed (US BLM lands) and none of\r\nthe mines moved millions of tons of rock and ore as in some of the eastern mines. The\r\nmajority of the roughly one thousand mining sites on the USFS lands are very small (less\r\nthan 100 tons or 70 cubic yards of dump material), are more than 2 miles from a major\r\nstream, or are so inaccessible as to prohibit reclamation. Twenty five sites have been\r\nconsidered by others to have significant size and potential for significant environmental\r\ndegradation. These most significant mining areas were evaluated by multiple criteria,\r\nincluding tendency to generate acid or liberate toxic metals, observed acidic pH or dead\r\nvegetation (?kill zones?) below dumps or adits, potential mobility of metals, and\r\nlikelihood of transport into streams of the watershed. In the author?s opinion, no single\r\nmeasurable parameter, such as metal concentration, is reliable for ranking significance or\r\nfeasibility of reclamation. Rather, subjective estimates are required to evaluate\r\ncombinations of, or interactions among, several parameters. The most subjective\r\nestimate in ranking feasibility of reclamation is the amount of natural and mine-related\r\ncontamination at each mining area. Mitigation of natural contributions at mines or\r\nunmined areas is beyond the scope of these Abandoned Mine Lands (AML)\r\ninvestigations, but must be considered when planning reclamation. Available\r\ninformation for the 25 problem sites is adequate for ranking, but at some sites additional\r\ninformation on groundwater conditions is needed for a more reliable ranking and\r\nevaluation of reclamation methods.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston","doi":"10.3133/ofr99170","usgsCitation":"Nash, J., 1999, Geochemical investigations and interim recommendations for priority abandoned mine sites on U.S.D.A. Forest Service lands, Mineral Creek watershed, San Juan County, Colorado: U.S. Geological Survey Open-File Report 99-170, 31 p., https://doi.org/10.3133/ofr99170.","productDescription":"31 p.","costCenters":[],"links":[{"id":156745,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":1704,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/ofr-99-0170/","linkFileType":{"id":5,"text":"html"}},{"id":406087,"rank":2,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_16449.htm","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Colorado","county":"San Juan County","otherGeospatial":"Mineral Creek watershed","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -107.804,\n              37.78\n            ],\n            [\n              -107.547,\n              37.78\n            ],\n            [\n              -107.547,\n              38.025\n            ],\n            [\n              -107.804,\n              38.025\n            ],\n            [\n              -107.804,\n              37.78\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b23e4b07f02db6ae242","contributors":{"authors":[{"text":"Nash, J. T.","contributorId":31751,"corporation":false,"usgs":true,"family":"Nash","given":"J. T.","affiliations":[],"preferred":false,"id":191178,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":22267,"text":"ofr9966 - 1999 - Water-quality assessment of the eastern Iowa basins: Data, September 1995 through September 1996","interactions":[],"lastModifiedDate":"2022-11-01T21:39:08.495779","indexId":"ofr9966","displayToPublicDate":"1999-10-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-66","title":"Water-quality assessment of the eastern Iowa basins: Data, September 1995 through September 1996","docAbstract":"<p>The U.S. Geological Survey began data-collection activities in the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program in September 1995 with the purpose of determining the status and trends in water quality. Surface-water data were collected, beginning in March 1996, on a monthly basis with occasional extra high- and low-flow samples. Data collected from 12 sites on rivers and streams in the study unit included determinations of the physical properties and concentrations of nutrients, major ions, organic carbon, trace elements, suspended sediment, and dissolved pesticides. Data collected at four additional sites included physical parameters and determination of the concentration of dissolved pesticides. In addition, bed-sediment and fish-tissue samples were collected at 16 sites and analyzed for trace elements and hydrophobic pesticides. There were two ground-water studies conducted in June and July 1996. The first looked at the quality of ground water in the Silurian-Devonian and Upper Carbonate aquifers and sampled 33 wells once, and the second examined the effects of agriculture on shallow ground water of the Iowa River alluvial aquifer and sampled 23 wells once. Ground-water samples were analyzed for physical properties, nutrients, major ions, organic carbon, trace elements, dissolved pesticides, and volatile organic compounds.</p>","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr9966","usgsCitation":"Akers, K.K., Schnoebelen, D.J., Savoca, M.E., Roberts, L.R., and Becher, K., 1999, Water-quality assessment of the eastern Iowa basins: Data, September 1995 through September 1996: U.S. Geological Survey Open-File Report 99-66, viii, 154 p., https://doi.org/10.3133/ofr9966.","productDescription":"viii, 154 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true},{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true},{"id":622,"text":"Washington Water Science 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&nbsp; &nbsp; Ground-Water Sample<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Analytical Procedures<br />&nbsp; &nbsp; &nbsp;Water-Quality Analysis and Quality Control<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Surface Water<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Biology<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Ground Water<br />Acknowledgments<br />Selected References<br />Hydrologic and Biologic Data</p>","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae3e4b07f02db688f53","contributors":{"authors":[{"text":"Akers, Kimberlee K.B.","contributorId":91137,"corporation":false,"usgs":true,"family":"Akers","given":"Kimberlee","email":"","middleInitial":"K.B.","affiliations":[],"preferred":false,"id":187867,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schnoebelen, Douglas J.","contributorId":87514,"corporation":false,"usgs":true,"family":"Schnoebelen","given":"Douglas","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":187866,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Savoca, Mark E. mesavoca@usgs.gov","contributorId":1961,"corporation":false,"usgs":true,"family":"Savoca","given":"Mark","email":"mesavoca@usgs.gov","middleInitial":"E.","affiliations":[{"id":622,"text":"Washington Water Science Center","active":true,"usgs":true}],"preferred":true,"id":187863,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Roberts, Linda R.","contributorId":13608,"corporation":false,"usgs":true,"family":"Roberts","given":"Linda","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":187865,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Becher, Kent 0000-0002-3947-0793 kdbecher@usgs.gov","orcid":"https://orcid.org/0000-0002-3947-0793","contributorId":3863,"corporation":false,"usgs":true,"family":"Becher","given":"Kent","email":"kdbecher@usgs.gov","affiliations":[{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"preferred":true,"id":187864,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":64948,"text":"i2431 - 1999 - Lithologic, age group, magnetopolarity, and geochemical maps of the Springerville Volcanic Field, east-central Arizona","interactions":[],"lastModifiedDate":"2023-06-14T14:05:32.630058","indexId":"i2431","displayToPublicDate":"1999-10-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":320,"text":"IMAP","code":"I","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2431","title":"Lithologic, age group, magnetopolarity, and geochemical maps of the Springerville Volcanic Field, east-central Arizona","docAbstract":"<p>The Springerville volcanic field is one of the many late Pliocene to Holocene, mostly basaltic, volcanic fields present near the Colorado Plateau margin (fig. 1, in pamphlet). The field overlies the lithospheric transition zone between the Colorado Plateau and the Basin and Range Province (Condit and others, 1989b). Establishing relations in time, space, and composition of the rocks of these plateau-margin fields offers the possibility to integrate more fully into a regional synthesis the detailed geochemistry of these fields now being examined (for example, Perry and others, 1987; Fitton and others, 1988; Menzies and others, 1991). The work also provides baseline information for understanding mantle properties and processes at different depths and locations. Because the Springerville field is the southernmost of the plateau-margin fields, and because it contains both tholeiitic and alkalic rocks (tables 1 and 2, in pamphlet), it is a particularly important location for establishing these patterns in time, space, and composition.</p>\n<br/>\n<p>Our four thematic maps of the Springerville field were compiled by using digital mapping techniques so that associated petrologic and chemical data could be conveniently included in a geographic information system for one of the plateau-margin fields. Parts of these maps have been included in Condit (1995), a stand-alone Macintosh2 computer program that takes advantage of their digital format.</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/i2431","isbn":"060792814X","usgsCitation":"Condit, C.D., Crumpler, L., and Aubele, J.C., 1999, Lithologic, age group, magnetopolarity, and geochemical maps of the Springerville Volcanic Field, east-central Arizona: U.S. Geological Survey IMAP 2431, Pamphlet: 53 p.; 3 Sheets: 56.58 x 38.32 inches or smaller, https://doi.org/10.3133/i2431.","productDescription":"Pamphlet: 53 p.; 3 Sheets: 56.58 x 38.32 inches or smaller","numberOfPages":"53","additionalOnlineFiles":"Y","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":286244,"rank":7,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/i2431.jpg"},{"id":109872,"rank":10,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_22658.htm","linkFileType":{"id":5,"text":"html"},"description":"22658"},{"id":91466,"rank":9,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/imap/2431/pdf/i2431pamphlet.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":6090,"rank":8,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/imap/2431/","linkFileType":{"id":5,"text":"html"}},{"id":286240,"rank":6,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/imap/2431/pdf/i2431sh4.pdf","text":"Sheet 4"},{"id":286239,"rank":5,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/imap/2431/pdf/i2431sh3.pdf","text":"Sheet 3"},{"id":286243,"rank":1,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/imap/2431/i2431sh4.ps"},{"id":286242,"rank":2,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/imap/2431/i2431sh3.ps"},{"id":286241,"rank":3,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/imap/2431/i2431sh2.ps"},{"id":286238,"rank":4,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/imap/2431/pdf/i2431sh2.pdf","text":"Sheet 2"}],"scale":"100000","country":"United States","state":"Arizona","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -110.1670,34.0000 ], [ -110.1670,34.5000 ], [ -109.2500,34.5000 ], [ -109.2500,34.0000 ], [ -110.1670,34.0000 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a61e4b07f02db635adf","contributors":{"authors":[{"text":"Condit, Christopher D.","contributorId":37328,"corporation":false,"usgs":true,"family":"Condit","given":"Christopher","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":272411,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Crumpler, Larry S.","contributorId":25460,"corporation":false,"usgs":true,"family":"Crumpler","given":"Larry S.","affiliations":[],"preferred":false,"id":272409,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Aubele, Jayne C.","contributorId":29735,"corporation":false,"usgs":true,"family":"Aubele","given":"Jayne","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":272410,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":32213,"text":"ofr99141 - 1999 - Geologic map of the Scotts Mills, Silverton, and Stayton Northeast 7.5 minute quadrangles, Northwest Oregon: A digital database","interactions":[],"lastModifiedDate":"2023-06-14T14:18:10.021466","indexId":"ofr99141","displayToPublicDate":"1999-09-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-141","title":"Geologic map of the Scotts Mills, Silverton, and Stayton Northeast 7.5 minute quadrangles, Northwest Oregon: A digital database","docAbstract":"The Scotts Mills, Silverton, and Stayton NE 7.5 minute quadrangles are situated along the eastern margin of the Willamette Valley and adjacent lower foothills (Waldo and Silverton Hills) of the Cascade Range (Fig. 1). The terrain within this area is of low to moderate relief, ranging from 100 to more than 1000 ft above sea level. This area is largely rural, with most of the valley floor and low-relief foothills under cultivation. In the last decade, the rural areas outside the boundaries of established towns have experienced significant growth in new homes built and the expansion of housing subdivisions. This growth has placed an increased demand on existing geologic resources (e.g., groundwater, sand and gravel, crushed stone) and the need to better understand potential geologic hazards within this region.\n\nPrevious geologic mapping by Piper (1942), Peck and others (1964), Newton (1969), Hampton (1972), Miller and Orr (1984), Orr and Miller (1984), and Miller and Orr (1986, 1988) established and refined the general stratigraphic framework of this region. This mapping identified few faults or folds; earlier investigators were hindered by the lack of reliably identifiable marker horizons within the stratigraphic section. Werner (1991), using available seismic profile lines and well data in the Willamette Valley to locate the top of the Columbia River Basalt Group, was able to identify and map faults within the subsurface. Reconnaissance mapping of the Columbia River Basalt Group (CRBG) units in this region in the early 1980’s indicated that these stratigraphic units could serve as a series of unique reference horizons for identifying post-Miocene folding and faulting (Beeson and others, 1985, 1989; Beeson and Tolan, 1990).\n\nThe major emphasis of this investigation was to identify and map CRBG units within the Scotts Mills, Silverton, and Stayton NE quadrangles and to utilize this detailed CRBG stratigraphy to identify and characterize structural features.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr99141","usgsCitation":"Tolan, T., Beeson, M., and Wheeler, K.L., 1999, Geologic map of the Scotts Mills, Silverton, and Stayton Northeast 7.5 minute quadrangles, Northwest Oregon: A digital database: U.S. Geological Survey Open-File Report 99-141, Report: HTML document; Readme: HTML; Readme: TXT; Readme: PDF, 15 p.; Data package; All files: PS; All files: PDF; 2 Sheets: 31.50 x 34.19 inches and 41.50 x 33.50 inches, https://doi.org/10.3133/ofr99141.","productDescription":"Report: HTML document; Readme: HTML; Readme: TXT; Readme: PDF, 15 p.; Data package; All files: PS; All files: PDF; 2 Sheets: 31.50 x 34.19 inches and 41.50 x 33.50 inches","numberOfPages":"15","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":108395,"rank":10,"type":{"id":20,"text":"Read Me"},"url":"https://pubs.usgs.gov/of/1999/0141/readme.txt","linkFileType":{"id":5,"text":"html"},"description":"13262"},{"id":60309,"rank":9,"type":{"id":20,"text":"Read Me"},"url":"https://pubs.usgs.gov/of/1999/0141/readme.html","linkFileType":{"id":1,"text":"pdf"}},{"id":3173,"rank":8,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0141/","linkFileType":{"id":5,"text":"html"}},{"id":284741,"rank":7,"type":{"id":20,"text":"Read Me"},"url":"https://pubs.usgs.gov/of/1999/0141/pdf/readme.pdf"},{"id":284742,"rank":4,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0141/intro.html"},{"id":284744,"rank":3,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0141/sssofrpdf.tar.gz"},{"id":163252,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0141/report-thumb.jpg"},{"id":284743,"rank":2,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0141/sssofr.tar.gz"},{"id":284746,"rank":6,"type":{"id":26,"text":"Sheet"},"url":"https://pubs.usgs.gov/of/1999/0141/pdf/stn.pdf","text":"Sheet 2"},{"id":284745,"rank":5,"type":{"id":26,"text":"Sheet"},"url":"https://pubs.usgs.gov/of/1999/0141/pdf/svsc.pdf","text":"Sheet 1"}],"scale":"24000","projection":"Universal Transverse Mercator projection","country":"United States","state":"Oregon","otherGeospatial":"Scott Mills, Silverton, Stayton","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -122.875,44.875 ], [ -122.875,45.125 ], [ -122.625833,45.125 ], [ -122.625833,44.875 ], [ -122.875,44.875 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd5d05e4b0b290850fadc6","contributors":{"authors":[{"text":"Tolan, Terry","contributorId":55489,"corporation":false,"usgs":true,"family":"Tolan","given":"Terry","affiliations":[],"preferred":false,"id":207986,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Beeson, Marvin","contributorId":102123,"corporation":false,"usgs":true,"family":"Beeson","given":"Marvin","affiliations":[],"preferred":false,"id":207987,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wheeler, Karen L. kwheeler@usgs.gov","contributorId":3404,"corporation":false,"usgs":true,"family":"Wheeler","given":"Karen","email":"kwheeler@usgs.gov","middleInitial":"L.","affiliations":[],"preferred":true,"id":207985,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":23034,"text":"ofr9970 - 1999 - Flood of June 15-17, 1998, Nishnabotna and East Nishnabotna rivers, Southwest Iowa","interactions":[],"lastModifiedDate":"2016-03-30T12:47:48","indexId":"ofr9970","displayToPublicDate":"1999-09-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-70","title":"Flood of June 15-17, 1998, Nishnabotna and East Nishnabotna rivers, Southwest Iowa","docAbstract":"<p>Record flooding occurred June 15-17, 1998, in the Nishnabotna and East Nishnabotna River basins following severe thunderstorm activity over southwest Iowa. More than 8 inches of rain fell over a large part of Cass County. The rain gage at Atlantic, Iowa recorded a 24-hour total rainfall of 13.18 inches, which established a new official State record for the greatest amount of rainfall in a 24-hour period. The peak discharge was 41,400 cubic feet per second in the East Nishnabotna River near Atlantic, 60,500 cubic feet per second in the East Nishnabotna River at Red Oak, and 65,100 cubic feet per second in the Nishnabotna River above Hamburg. The peak discharge at Atlantic was greater than the theoretical 200-year flood and the peak discharges at Red Oak and Hamburg were greater than the respective theoretical 500-year floods. Information about the basin, the rain storms, the flooding, and a profile of high water marks at selected intervals along the Nishnabotna and East Nishnabotna Rivers are presented in this report.</p>","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Iowa City, IA","doi":"10.3133/ofr9970","issn":"0094-9140","collaboration":"Prepared in cooperation with the Iowa Department of Transportation and Iowa Highway Research Board (Project HR-140)","usgsCitation":"Fischer, E., 1999, Flood of June 15-17, 1998, Nishnabotna and East Nishnabotna rivers, Southwest Iowa: U.S. Geological Survey Open-File Report 99-70, iv, 15 p., https://doi.org/10.3133/ofr9970.","productDescription":"iv, 15 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science 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E.E.","contributorId":102480,"corporation":false,"usgs":true,"family":"Fischer","given":"E.E.","email":"","affiliations":[],"preferred":false,"id":189323,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":32211,"text":"ofr99127 - 1999 - An evaluation of sand and gravel resources in and near the Prescott National Forest in the Verde Valley, Arizona, with a section on evaluation of sand and gravel resources using selected engineering variables","interactions":[],"lastModifiedDate":"2023-06-14T14:15:32.719571","indexId":"ofr99127","displayToPublicDate":"1999-09-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-127","title":"An evaluation of sand and gravel resources in and near the Prescott National Forest in the Verde Valley, Arizona, with a section on evaluation of sand and gravel resources using selected engineering variables","docAbstract":"This study was based on available published literature. Although no field investigation was conducted in the Prescott National Forest to the west of the Verde River, a field investigation was conducted in the summer of 1994 by this author on the Coconino National Forest, to the east of the Verde River, where units of surficial materials of the same age and similar character are found (Cox, 1995). The intent of this evaluation of sand and gravel resources in the Prescott National Forest and adjacent areas in the Verde Valley, is to provide the land managers of the U.S. Forest Service with a map that delineates sand- and gravel-bearing geologic units. The map distinguishes (1) sand-and gravel-bearing units that are limited to channels from those that are not, (2) sand-and gravel-bearing units that are thin (generally less than 40 feet thick which is one contour interval on the topographic maps) from those that are locally thick (generally 40 feet or more), (3) sand- and gravel-bearing units that are poorly sorted from those that are well-sorted4, (4) sand- and gravel-bearing units that have little or no soil development from those that have greater degrees of soil development and lithification, (5) and sand- and gravel-bearing units that support riparian vegetation from those that do not. These distinctive characteristics are related to the geologic age or depositional setting of the rock materials and can be distinguished where areas are mapped in detail.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr99127","usgsCitation":"Cox, L.J., Bliss, J.D., and Miller, R.J., 1999, An evaluation of sand and gravel resources in and near the Prescott National Forest in the Verde Valley, Arizona, with a section on evaluation of sand and gravel resources using selected engineering variables: U.S. Geological Survey Open-File Report 99-127, Report: iv, 40 p.; 1 Plate: 36.00 x 48.00 inches; Readme; Dataset, https://doi.org/10.3133/ofr99127.","productDescription":"Report: iv, 40 p.; 1 Plate: 36.00 x 48.00 inches; Readme; Dataset","numberOfPages":"44","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":163158,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr99127.jpg"},{"id":403563,"rank":6,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_54572.htm","linkFileType":{"id":5,"text":"html"}},{"id":284819,"rank":4,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1999/0127/pdf/of99-127plate1.pdf","text":"Plate 1","linkFileType":{"id":1,"text":"pdf"}},{"id":284816,"rank":3,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0127/pdf/OF99-127.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":284818,"rank":2,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0127/cverde.tar.Z"},{"id":284815,"rank":5,"type":{"id":20,"text":"Read Me"},"url":"https://pubs.usgs.gov/of/1999/0127/readme.txt"},{"id":3172,"rank":7,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0127/","linkFileType":{"id":5,"text":"html"}}],"scale":"50000","projection":"Universal Transverse Mercator projection","datum":"National Geodetic Vertical Datum of 1929","country":"United States","state":"Arizona","county":"Coconino County, Yavapai County","otherGeospatial":"Prescott National Forest, Verde Valley","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -112.125,\n              34.625\n            ],\n            [\n              -111.875,\n              34.625\n            ],\n            [\n              -111.875,\n              34.875\n            ],\n            [\n              -112.125,\n              34.875\n            ],\n            [\n              -112.125,\n              34.625\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd4c85e4b0b290850f106c","contributors":{"authors":[{"text":"Cox, Leslie J.","contributorId":92692,"corporation":false,"usgs":true,"family":"Cox","given":"Leslie","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":207982,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bliss, James D. jbliss@usgs.gov","contributorId":2790,"corporation":false,"usgs":true,"family":"Bliss","given":"James","email":"jbliss@usgs.gov","middleInitial":"D.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":207981,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Miller, Robert J. rjmiller@usgs.gov","contributorId":2516,"corporation":false,"usgs":true,"family":"Miller","given":"Robert","email":"rjmiller@usgs.gov","middleInitial":"J.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":207980,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":23891,"text":"ofr99137 - 1999 - Comparison of seismic slope-performance models: Case study of the Oakland East quadrangle, California","interactions":[],"lastModifiedDate":"2022-08-29T21:30:24.794442","indexId":"ofr99137","displayToPublicDate":"1999-09-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-137","title":"Comparison of seismic slope-performance models: Case study of the Oakland East quadrangle, California","docAbstract":"<p>No abstract available.</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr99137","usgsCitation":"Miles, S.B., and Keefer, D.K., 1999, Comparison of seismic slope-performance models: Case study of the Oakland East quadrangle, California: U.S. Geological Survey Open-File Report 99-137, 38 p., https://doi.org/10.3133/ofr99137.","productDescription":"38 p.","costCenters":[],"links":[{"id":405849,"rank":2,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_16287.htm","linkFileType":{"id":5,"text":"html"}},{"id":53100,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1999/0137/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":156666,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0137/report-thumb.jpg"},{"id":1617,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://permanent.access.gpo.gov/lps52607/index.htm","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"California","otherGeospatial":"Oakland East quadrangle","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -122.25,\n              37.75\n            ],\n            [\n              -122.125,\n              37.75\n            ],\n            [\n              -122.125,\n              37.875\n            ],\n            [\n              -122.25,\n              37.875\n            ],\n            [\n              -122.25,\n              37.75\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b23e4b07f02db6ae251","contributors":{"authors":[{"text":"Miles, Scott B.","contributorId":38600,"corporation":false,"usgs":true,"family":"Miles","given":"Scott","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":190916,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Keefer, David K.","contributorId":77930,"corporation":false,"usgs":true,"family":"Keefer","given":"David","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":190917,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":23941,"text":"ofr9932 - 1999 - Preliminary geologic map of the San Guillermo Mountain Quadrangle, Ventura County, California","interactions":[],"lastModifiedDate":"2017-03-09T14:08:29","indexId":"ofr9932","displayToPublicDate":"1999-08-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-32","title":"Preliminary geologic map of the San Guillermo Mountain Quadrangle, Ventura County, California","docAbstract":"New 1:24,000-scale geologic mapping in the Cuyama 30' x 60' quadrangle, in support of the USGS Southern California Areal Mapping Project (SCAMP), is contributing to a more complete understanding of the stratigraphy, structure, and tectonic evolution of the complex junction area between the NW-striking Coast Ranges and EW-striking western Transverse Ranges. The 1:24,000-scale geologic map of the San Guillermo Mountain quadrangle is one of six contiguous 7 1/2' quadrangle geologic maps in the eastern part of the Cuyama map area being compiled for a more detailed portrayal and reevaluation of geologic structures and rock units shown on previous geologic maps of the area (e.g., Dibblee, 1979). The following observations and interpretations are based on the new San Guillermo Mountain geologic compilation: \r\n(1) The new geologic mapping in the northern part of the San Guillermo Mountain quadrangle allows for reinterpretation of fault architecture that bears on potential seismic hazards of the region. Previous mapping had depicted the eastern Big Pine fault (BPF) as a northeast-striking, sinistral strike-slip fault that extends for 30 km northeast of the Cuyama River to its intersection with the San Andreas fault (SAF). In contrast the new mapping indicates that the eastern BPF is a thrust fault that curves from a northeast strike to an east strike, where it is continuous with the San Guillermo thrust fault, and dies out further east about 15 km south of the SAF. This redefined segment of the BPF is a south-dipping, north-directed thrust, with dominantly dip slip components (rakes > 60 deg.), that places Middle Eocene marine rocks (Juncal and Matilija Formations) over Miocene through Pliocene(?) nonmarine rocks (Caliente, Quatal, and Morales Formations). Although a broad northeast-striking fault zone, exhibiting predominantly sinistral components of slip (rakes < 45 deg.), extends to the SAF as previously mapped, the fault zone does not connect to the southwest with the BPF but instead curves into a southwest-directed thrust fault system a short distance north of the BPF. Oligocene to Pliocene(?) nonmarine sedimentary and volcanic rocks of the Plush Ranch, Caliente, and Morales(?) Formations are folded on both sides of this fault zone (informally named the Lockwood Valley fault zone [LVFZ] on the map). South-southeast of the LVFZ overturned folds have southward vergence. Several moderate-displacement (< 50 m), mainly northwest-dipping thrust and reverse faults, exhibiting mostly sinistral-oblique slip, flank and strike parallel to the overturned folds. The fold vergence and thrust direction associated with the LVFZ is opposite to that of the redefined BPF, providing further evidence that the two faults are distinct structures. These revised fault interpretations bring into question earlier estimates of net sinistral strike-slip displacement of as much as 13 km along the originally defined eastern BPF, which assumed structural connection with the LVFZ. Also, despite sparse evidence for repeated Quaternary movement on the LVFZ (e.g., Dibblee, 1982), the potential for a large earthquake involving coseismic slip on both the LVFZ and the central BPF to the southwest may not be as great as once believed. (2) Several generations of Pleistocene and younger dissected alluvial terrace and fan deposits sit at various levels above modern stream channels throughout the quadrangle. These deposits give testimony to the recent uplift and related fault deformation that has occurred in the area. (3) A vast terrane of Eocene marine sedimentary rocks (Juncal and Matilija Formations and Cozy Dell Shale) exposed south of the Big Pine fault forms the southern two-thirds of the San Guillermo Mountain quadrangle. Benthic foraminifers collected from various shale intervals within the Juncal Formation indicate a Middle Eocene age (Ulatisian) for the entire formation (K. McDougall, unpub. data, 1998) and deposition at paleodepths as great as 2,000 m (i.e., lowe","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr9932","issn":"0094-9140","usgsCitation":"Minor, S., 1999, Preliminary geologic map of the San Guillermo Mountain Quadrangle, Ventura County, California: U.S. Geological Survey Open-File Report 99-32, https://doi.org/10.3133/ofr9932.","costCenters":[],"links":[{"id":154924,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":1648,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/ofr-99-0032/","linkFileType":{"id":5,"text":"html"}},{"id":109852,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_22573.htm","linkFileType":{"id":5,"text":"html"},"description":"22573"}],"country":"United States","state":"California","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac7e4b07f02db67ac75","contributors":{"authors":[{"text":"Minor, S.A.","contributorId":65047,"corporation":false,"usgs":true,"family":"Minor","given":"S.A.","email":"","affiliations":[],"preferred":false,"id":191012,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":24061,"text":"ofr9934 - 1999 - Geologic map of the Hart Peak quadrangle, California and Nevada: A digital database","interactions":[],"lastModifiedDate":"2023-06-14T14:47:54.029909","indexId":"ofr9934","displayToPublicDate":"1999-08-01T00:00:00","publicationYear":"1999","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"99-34","title":"Geologic map of the Hart Peak quadrangle, California and Nevada: A digital database","docAbstract":"The Hart Peak 1:24,000-scale quadrangle is located about 12 km southwest of Searchlight, Nevada, comprehending the eastern part of the Castle Peaks, California, and most of the Castle Mountains and the northwestern part of the Piute Range, in California and Nevada. The Castle Peaks area constitutes the northeasternmost part of the northeast-trending New York Mountains. The Castle Mountains straddle the California-Nevada State line between the Castle Peaks and north-trending Piute Range. The southern part of the Piute Range, near Civil War-era Fort Piute, adjoins Homer Mountain mapped by Spencer and Turner (1985). Adjacent and nearby 1:24,000-scale quadrangles include Castle Peaks, East of Grotto Hills, Homer Mountain, and Signal Hill, Calif.; also Tenmile Well and West of Juniper Mine, Calif. and Nev.\n\nThe oldest rocks in the Hart Peak quadrangle are Early Proterozoic gneiss and foliated granite that crop out in the northern part of the quadrangle on the eastern flank of the Castle Peaks and in the central Castle Mountains (Wooden and Miller, 1990). Paleozoic rocks are uncommon and Mesozoic granitic rocks are not found in the map area. The older rocks are overlain nonconformably by several km of Miocene volcanic deposits, which accumulated in local basins. Local dikes and domes are sources of most Miocene eruptive units; younger Miocene intrusions cut all the older rocks. Upper Miocene to Quaternary gravel deposits interfinger with the uppermost volcanic flows; the contact between volcanic rocks and the gravel deposits is unconformable locally. Canyons and intermontane valleys contain dissected Quaternary alluvialfan deposits that are mantled by active drainage and alluvial fan detritus.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr9934","usgsCitation":"Nielson, J.E., Turner, R., and Bedford, D., 1999, Geologic map of the Hart Peak quadrangle, California and Nevada: A digital database: U.S. Geological Survey Open-File Report 99-34, Pamphlet: 44 p., 1 Plate: 40.00 x 36.00 inches, https://doi.org/10.3133/ofr9934.","productDescription":"Pamphlet: 44 p., 1 Plate: 40.00 x 36.00 inches","numberOfPages":"44","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":1731,"rank":10,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/1999/0034/","linkFileType":{"id":5,"text":"html"}},{"id":108386,"rank":12,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/pdf/hpk_geo.pdf","linkFileType":{"id":5,"text":"html"},"description":"13175"},{"id":156778,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1999/0034/report-thumb.jpg"},{"id":53235,"rank":11,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1999/0034/pdf/hpk_map.pdf","text":"Plate 1","linkFileType":{"id":1,"text":"pdf"}},{"id":284851,"rank":2,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/hpk_geol.e00.gz"},{"id":284852,"rank":3,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/hpk_str.e00.gz"},{"id":284853,"rank":4,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/hpk_smpl.e00.gz"},{"id":284854,"rank":5,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/hpk_shr.e00.gz"},{"id":284855,"rank":6,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/of99-34_3a.tar.gz"},{"id":284856,"rank":7,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/import.aml"},{"id":284857,"rank":8,"type":{"id":7,"text":"Companion Files"},"url":"https://pubs.usgs.gov/of/1999/0034/of99-34_2a.txt"},{"id":397727,"rank":9,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_13175.htm"}],"scale":"24000","projection":"Universal Transverse Mercator projection","datum":"National Geodetic Datum of 1929","country":"United States","state":"California, Nevada","otherGeospatial":"Hart Peak quadrangle","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -115.125,35.25 ], [ -115.125,35.375 ], [ -115.0,35.375 ], [ -115.0,35.25 ], [ -115.125,35.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd5c8be4b0b290850fa8a4","contributors":{"authors":[{"text":"Nielson, Jane E.","contributorId":9701,"corporation":false,"usgs":true,"family":"Nielson","given":"Jane","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":191238,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Turner, Ryan D.","contributorId":76596,"corporation":false,"usgs":true,"family":"Turner","given":"Ryan D.","affiliations":[],"preferred":false,"id":191240,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bedford, David R.","contributorId":26352,"corporation":false,"usgs":true,"family":"Bedford","given":"David R.","affiliations":[],"preferred":false,"id":191239,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
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