Reconnaissance investigations of the heretofore little known volcanic assemblage on St Matthew Island provide significant information on the tectonic history of the Bering Sea shelf. St. Matthew Island is made up of approximately 500 m of subaerial calc-alkaline volcanic rocks ranging in composition from high-alumina basalt to rhyolite. Four K-Ar analyses of samples from this volcanic sequence give Late Cretaceous ages of 65-77 m.y., and intercalated carbonaceous tuff layers yield Cretaceous pollen assemblages. Along the northeast coast of St. Matthew Island, the volcanic rocks are intruded by granodiorite that gives an early Tertiary K-Ar age of 61 m.y. Correlations with on-land geology in northeast Siberia and marine geophysical data from the western Bering Sea strongly suggest that St. Matthew Island represents a southeastward extension of the Okhotsk-Chukotsk belt, a Cretaceous and early Tertiary volcanic arc that borders the Pacific margin of Siberia for nearly 3,000 km. The apparent continuation of this volcanic arc along the margin of the Bering shelf at least as far east as St. Matthew Island supports suggestions by Burk and by Scholl and others that in late Mesozoic time the Pacific plate margin coincided with the present Bering shelf margin and did not shift to the Aleutian trench until the end of Cretaceous or the beginning of Tertiary time.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","usgsCitation":"Patton, W.W., Lanphere, M.A., Miller, T.P., and Scott, R., 1976, Age and tectonic significance of volcanic rocks on St. Matthew Island, Bering Sea, Alaska: Journal of Research of the U.S. Geological Survey, v. 4, no. 1, p. 67-73.","productDescription":"7 p.","startPage":"67","endPage":"73","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":314843,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":314842,"rank":1,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/journal/1976/vol4issue1/report.pdf","text":"Report","size":"16.18 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Report"}],"country":"United States","state":"Alaska","otherGeospatial":"Bering Sea, St. Matthew Island","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -172.9083251953125,\n 60.56942751033994\n ],\n [\n -172.89459228515625,\n 60.58696734225869\n ],\n [\n -172.88909912109375,\n 60.604497655208455\n ],\n [\n -172.9412841796875,\n 60.61528081030649\n ],\n [\n -172.98797607421875,\n 60.59505943854488\n ],\n [\n -173.0291748046875,\n 60.58157148491742\n ],\n [\n -173.06488037109375,\n 60.56267888575776\n ],\n [\n -173.0731201171875,\n 60.534319275500465\n ],\n [\n -173.0841064453125,\n 60.508639153551826\n ],\n [\n -173.05389404296875,\n 60.48970392643919\n ],\n [\n -173.0126953125,\n 60.484291829879204\n ],\n [\n -172.97149658203125,\n 60.47346492719931\n ],\n [\n -172.93304443359375,\n 60.455863503213834\n ],\n [\n -172.85064697265625,\n 60.41656438628133\n ],\n [\n -172.760009765625,\n 60.36771313471161\n ],\n [\n -172.70233154296875,\n 60.34461900141174\n ],\n [\n -172.63916015625,\n 60.326947742998414\n ],\n [\n -172.6007080078125,\n 60.31334795477253\n ],\n [\n -172.55950927734375,\n 60.314708188485575\n ],\n [\n -172.50732421875,\n 60.32286840124156\n ],\n [\n -172.41668701171875,\n 60.329667021005825\n ],\n [\n -172.3699951171875,\n 60.32286840124156\n ],\n [\n -172.342529296875,\n 60.306545936453226\n ],\n [\n -172.298583984375,\n 60.28749274926003\n ],\n [\n -172.24090576171875,\n 60.292937650406586\n ],\n [\n -172.19146728515625,\n 60.314708188485575\n ],\n [\n -172.22991943359375,\n 60.326947742998414\n ],\n [\n -172.30682373046872,\n 60.34597793265678\n ],\n [\n -172.35351562499997,\n 60.37042901631508\n ],\n [\n -172.3974609375,\n 60.403001945865476\n ],\n [\n -172.44415283203125,\n 60.40707127161831\n ],\n [\n -172.4798583984375,\n 60.39757538658667\n ],\n [\n -172.55676269531247,\n 60.39757538658667\n ],\n [\n -172.65289306640625,\n 60.42198777960337\n ],\n [\n -172.85064697265625,\n 60.50187784207829\n ],\n [\n -172.89459228515625,\n 60.53837217051857\n ],\n [\n -172.9083251953125,\n 60.56942751033994\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"4","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"56a7553fe4b0b28f1184d7c4","contributors":{"authors":[{"text":"Patton, William W. Jr.","contributorId":107355,"corporation":false,"usgs":true,"family":"Patton","given":"William","suffix":"Jr.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":589740,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lanphere, Marvin A. alder@usgs.gov","contributorId":2696,"corporation":false,"usgs":true,"family":"Lanphere","given":"Marvin","email":"alder@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":589741,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Miller, Thomas P. tmiller@usgs.gov","contributorId":4183,"corporation":false,"usgs":true,"family":"Miller","given":"Thomas","email":"tmiller@usgs.gov","middleInitial":"P.","affiliations":[{"id":121,"text":"Alaska Volcano Observatory","active":false,"usgs":true}],"preferred":false,"id":589742,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Scott, Richard A.","contributorId":14414,"corporation":false,"usgs":true,"family":"Scott","given":"Richard A.","affiliations":[],"preferred":false,"id":589743,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70011085,"text":"70011085 - 1976 - Holocene sedimentation history of the major fan valleys of Monterey fan","interactions":[],"lastModifiedDate":"2025-04-17T15:28:53.173043","indexId":"70011085","displayToPublicDate":"2003-04-07T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Holocene sedimentation history of the major fan valleys of Monterey fan","docAbstract":"There are three major fan valleys on upper Monterey fan. Deep-tow geophysical profiles and 40 sediment cores provide the basis for evaluation of the sedimentation histories of these valleys. Monterey fan valley leads from Monterey canyon to a major suprafan and is bounded by levees that crest more than 400 m above the valley floor. The valley passes through a large z-bend or meander. Monterey East fan valley joins Monterey fan valley at the meander at about 150 m above the valley floor, and marks an earlier position of the lower Monterey fan valley. Ascension valley, a hanging contributary to the Monterey fan valley, appears to have once been the shoreward head of the lower part of the present Monterey fan valley. The relief of Monterey fan valley appears from deep-tow profiles to be erosional. The valley is floored with sand. Holocene turbidity currents do not overtop the levees 400 m above the valley floor, but do at times overflow and transport sand into Monterey East valley, producing a sandy floor. An 1100 m by 300 m dune field was observed on side scan sonar in Monterey East valley.
Ascension fan valley was floored with sand during glacial intervals of lowered sea level, then was cut off from its sand source as sea level rose. A narrow (500 m), erosional, meandering channel was incised into the flat valley floor; the relief features otherwise appear depositional, with a hummocky topography perhaps produced in the manner of a braided riverbed. The sand is mantled by about 6 m of probable Holocene mud. Hummocky relief on the back side of the northwestern levees of both Ascension and Monterey valleys is characteristic of many turbidite valleys in the northeast Pacific. The hummocky topography is produced by dune-like features that migrate toward levee crests during growth.
","language":"English","publisher":"Elsevier","doi":"10.1016/0025-3227(76)90063-3","issn":"00253227","usgsCitation":"Hess, G., and Normark, W.R., 1976, Holocene sedimentation history of the major fan valleys of Monterey fan: Marine Geology, v. 22, no. 4, p. 233-251, https://doi.org/10.1016/0025-3227(76)90063-3.","productDescription":"19 p.","startPage":"233","endPage":"251","costCenters":[],"links":[{"id":221219,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","city":"Monterey","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -121.97211248916773,\n 36.649615001075986\n ],\n [\n -121.97211248916773,\n 36.59389137442635\n ],\n [\n -121.86768635161255,\n 36.59389137442635\n ],\n [\n -121.86768635161255,\n 36.649615001075986\n ],\n [\n -121.97211248916773,\n 36.649615001075986\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"22","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a31f3e4b0c8380cd5e3a9","contributors":{"authors":[{"text":"Hess, G.R.","contributorId":17606,"corporation":false,"usgs":true,"family":"Hess","given":"G.R.","email":"","affiliations":[],"preferred":false,"id":360244,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Normark, W. R.","contributorId":87137,"corporation":false,"usgs":true,"family":"Normark","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":360245,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70010915,"text":"70010915 - 1976 - Large sand waves on the Atlantic Outer Continental Shelf around Wilmington Canyon, off Eastern United States","interactions":[],"lastModifiedDate":"2025-04-17T15:39:49.224639","indexId":"70010915","displayToPublicDate":"2003-04-04T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Large sand waves on the Atlantic Outer Continental Shelf around Wilmington Canyon, off Eastern United States","docAbstract":"New seismic-reflection data show that large sand waves near the head of Wilmington Canyon on the Atlantic Outer Continental Shelf have a spacing of 100-650 m and a relief of 2-9 m. The bedforms trend northwest and are asymmetrical, the steeper slopes being toward the south or west. Vibracore sediments indicate that the waves apparently have formed on a substrate of relict nearshore sediments. Although the age of the original bedforms is unknown, the asymmetry is consistent with the dominant westerly to southerly drift in this area which has been determined by other methods; the asymmetry, therefore, is probably modern. Observations in the sand-wave area from a submersible during August 1975, revealed weak bottom currents, sediment bioturbation, unrippled microtopography, and lack of scour. Thus, the asymmetry may be maintained by periodic water motion, possibly associated with storms or perhaps with flow in the canyon head.
","language":"English","publisher":"Elsevier","doi":"10.1016/0025-3227(76)90003-7","issn":"00253227","usgsCitation":"Knebel, H., and Folger, D.W., 1976, Large sand waves on the Atlantic Outer Continental Shelf around Wilmington Canyon, off Eastern United States: Marine Geology, v. 22, no. 1, p. M7-M15, https://doi.org/10.1016/0025-3227(76)90003-7.","productDescription":"9 p.","startPage":"M7","endPage":"M15","costCenters":[],"links":[{"id":221629,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Wilmington Canyon","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -75.07922635000519,\n 40.354699173945505\n ],\n [\n -75.07922635000519,\n 37.06700454662226\n ],\n [\n -72.40892669843684,\n 37.06700454662226\n ],\n [\n -72.40892669843684,\n 40.354699173945505\n ],\n [\n -75.07922635000519,\n 40.354699173945505\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"22","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a4482e4b0c8380cd66b83","contributors":{"authors":[{"text":"Knebel, H.J.","contributorId":79092,"corporation":false,"usgs":true,"family":"Knebel","given":"H.J.","affiliations":[],"preferred":false,"id":359888,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Folger, D. W.","contributorId":97126,"corporation":false,"usgs":true,"family":"Folger","given":"D.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":359889,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":59515,"text":"mf728B - 1976 - Map showing heavy mineral resources in Pleistocene sand of the Port Leyden quadrangle, southwestern Adirondack Mountains, New York","interactions":[],"lastModifiedDate":"2025-05-14T19:35:50.534248","indexId":"mf728B","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"728","chapter":"B","title":"Map showing heavy mineral resources in Pleistocene sand of the Port Leyden quadrangle, southwestern Adirondack Mountains, New York","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf728B","usgsCitation":"Force, E.R., Lipin, B., and Smith, R.E., 1976, Map showing heavy mineral resources in Pleistocene sand of the Port Leyden quadrangle, southwestern Adirondack Mountains, New York: U.S. Geological Survey Miscellaneous Field Studies Map 728, 1 Plate: 35.93 × 34.71 inches, https://doi.org/10.3133/mf728B.","productDescription":"1 Plate: 35.93 × 34.71 inches","costCenters":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"links":[{"id":390533,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_3865.htm"},{"id":276400,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/0728b/plate-1.pdf"},{"id":185068,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"24000","country":"United States","state":"New York","otherGeospatial":"Port Leyden quadrangle","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -75.375,43.5 ], [ -75.375,43.6275 ], [ -75.25,43.6275 ], [ -75.25,43.5 ], [ -75.375,43.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b15e4b07f02db6a4a27","contributors":{"authors":[{"text":"Force, E. R.","contributorId":28235,"corporation":false,"usgs":true,"family":"Force","given":"E.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":262146,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lipin, B. R.","contributorId":61031,"corporation":false,"usgs":true,"family":"Lipin","given":"B. R.","affiliations":[],"preferred":false,"id":262147,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Smith, R. E.","contributorId":76366,"corporation":false,"usgs":true,"family":"Smith","given":"R.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":262148,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":46400,"text":"ofr76203 - 1976 - Map showing physical characteristics of the land surface, East Brookfield quadrangle, south-central Massachusetts","interactions":[],"lastModifiedDate":"2022-04-06T19:07:38.887586","indexId":"ofr76203","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-203","title":"Map showing physical characteristics of the land surface, East Brookfield quadrangle, south-central Massachusetts","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr76203","usgsCitation":"Pomeroy, J.S., 1976, Map showing physical characteristics of the land surface, East Brookfield quadrangle, south-central Massachusetts: U.S. Geological Survey Open-File Report 76-203, Report: 8 p.; 1 Plate: 22.44 × 29.78 inches, https://doi.org/10.3133/ofr76203.","productDescription":"Report: 8 p.; 1 Plate: 22.44 × 29.78 inches","costCenters":[],"links":[{"id":390203,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_74752.htm"},{"id":169396,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1976/0203/report-thumb.jpg"},{"id":83357,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1976/0203/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":83358,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1976/0203/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"24000","country":"United States","state":"Massachusetts","otherGeospatial":"East Brookfield quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -72,\n 42.25\n ],\n [\n -72.125,\n 42.25\n ],\n [\n -72.125,\n 42.125\n ],\n [\n -72,\n 42.125\n ],\n [\n -72,\n 42.25\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b13e4b07f02db6a36cb","contributors":{"authors":[{"text":"Pomeroy, John S.","contributorId":18329,"corporation":false,"usgs":true,"family":"Pomeroy","given":"John","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":233216,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":47614,"text":"wri76104 - 1976 - Maps showing ground-water conditions in the Concho, St. Johns, and White Mountains areas, Apache and Navajo Counties, Arizona, 1975","interactions":[],"lastModifiedDate":"2018-01-24T16:21:05","indexId":"wri76104","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"76-104","title":"Maps showing ground-water conditions in the Concho, St. Johns, and White Mountains areas, Apache and Navajo Counties, Arizona, 1975","docAbstract":"The Concho, St. Johns, and White Mountains areas cover about 2 ,300 sq mi in eastern Arizona. Ground water is present in several aquifers that are made up of one or more formations. The maps show ground-water conditions in the Coconini aquifer; in the Triassic, Cretaceous, and Tertiary rocks; and in the alluvium and basaltic rocks. Information on the maps includes depth to water, altitude of the water level, chemical quality of the water, irrigated area, and hydrographs of the water level in selected wells. Scale 1:125,000. 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","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf785","usgsCitation":"Ruppel, B.D., and McHendrie, A.G., 1976, Free-air gravity anomaly map of the eastern Chukchi and southern Beaufort seas: U.S. Geological Survey Miscellaneous Field Studies Map 785, 1 Plate: 33.90 x 21.57 inches, https://doi.org/10.3133/mf785.","productDescription":"1 Plate: 33.90 x 21.57 inches","costCenters":[],"links":[{"id":417053,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/0785/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":182313,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/mf/0785/report-thumb.jpg"},{"id":417095,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_3956.htm","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Alaska","otherGeospatial":"Chukchi Sea, Beaufort Sea","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -175,66 ], [ -175,72 ], [ -135,72 ], [ -135,66 ], [ -175,66 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b1ae4b07f02db6a8688","contributors":{"authors":[{"text":"Ruppel, Byron D.","contributorId":64254,"corporation":false,"usgs":true,"family":"Ruppel","given":"Byron","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":264345,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McHendrie, A. Graig","contributorId":13635,"corporation":false,"usgs":true,"family":"McHendrie","given":"A.","email":"","middleInitial":"Graig","affiliations":[],"preferred":false,"id":264346,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":58763,"text":"mf716 - 1976 - Preliminary residual magnetic map of the eastern Bering Shelf and parts of western Alaska","interactions":[],"lastModifiedDate":"2023-04-14T21:59:52.217426","indexId":"mf716","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"716","title":"Preliminary residual magnetic map of the eastern Bering Shelf and parts of western Alaska","docAbstract":"Residual magnetic anomalies for the offshore data were calculated by subtracting the Earth's main dipole field, adjusted for secular variations (based on the International Geomagnetic Reference Field (IGRF), epoch 1965, Fabiano and Peddie, 1969), from the observed values of the surveys listed below. The effects of diurnal variations and magnetic storms have been ignored. Individual marine magnetic profiles have been upward continued to an elevation of 1 km (Robinson, 1970; Henderson, 1970) on the assumption that the magnetic sources are two-dimensional in a direction normal to the ship's track. The upward continued profiles were computed by convolving each profile with an optimum (7, 15 or 30 points) upward continuation operator. Additional errors of unknown magnitude result from the use of two-dimensional analytic techniques in a three-dimensional field. However, on the average, values at crossings differ by only 10 percent.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf716","usgsCitation":"Bailey, K.A., Cooper, A.K., Marlow, M.S., and Scholl, D.W., 1976, Preliminary residual magnetic map of the eastern Bering Shelf and parts of western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 716, 1 Plate: 42.71 x 33.03 inches, https://doi.org/10.3133/mf716.","productDescription":"1 Plate: 42.71 x 33.03 inches","costCenters":[],"links":[{"id":415812,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/0716/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":184033,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/mf/0716/report-thumb.jpg"}],"scale":"2500000","country":"United States","state":"Alaska","otherGeospatial":"eastern Bering Shelf, western Alaska","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -180,52 ], [ -180,64 ], [ -156,64 ], [ -156,52 ], [ -180,52 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aade4b07f02db66b405","contributors":{"authors":[{"text":"Bailey, Kimberly A.","contributorId":48626,"corporation":false,"usgs":true,"family":"Bailey","given":"Kimberly","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":260697,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cooper, Alan K. acooper@usgs.gov","contributorId":2854,"corporation":false,"usgs":true,"family":"Cooper","given":"Alan","email":"acooper@usgs.gov","middleInitial":"K.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":260698,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Marlow, Michael S.","contributorId":72775,"corporation":false,"usgs":true,"family":"Marlow","given":"Michael","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":260696,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Scholl, David W. 0000-0001-6500-6962 dscholl@usgs.gov","orcid":"https://orcid.org/0000-0001-6500-6962","contributorId":3738,"corporation":false,"usgs":true,"family":"Scholl","given":"David","email":"dscholl@usgs.gov","middleInitial":"W.","affiliations":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true},{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":260699,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":59763,"text":"mf811 - 1976 - Preliminary map showing products of eruptions, 1962-1974, from the Upper East Rift Zone of Kilauea Volcano, Hawaii","interactions":[],"lastModifiedDate":"2019-06-17T11:23:25","indexId":"mf811","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"811","title":"Preliminary map showing products of eruptions, 1962-1974, from the Upper East Rift Zone of Kilauea Volcano, Hawaii","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/mf811","usgsCitation":"Holcomb, R.T., 1976, Preliminary map showing products of eruptions, 1962-1974, from the Upper East Rift Zone of Kilauea Volcano, Hawaii: U.S. Geological Survey Miscellaneous Field Studies Map 811, 1 Plate: 33.62 x 43.49 inches, https://doi.org/10.3133/mf811.","productDescription":"1 Plate: 33.62 x 43.49 inches","costCenters":[],"links":[{"id":364660,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/0811/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":182549,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/mf/0811/report-thumb.jpg"}],"scale":"0","country":"United States","state":"Hawaii","otherGeospatial":"Kilauea Volcano","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -155.25,19.25 ], [ -155.25,19.3675 ], [ -155.1175,19.3675 ], [ -155.1175,19.25 ], [ -155.25,19.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ab0e4b07f02db66d65b","contributors":{"authors":[{"text":"Holcomb, R. T.","contributorId":99146,"corporation":false,"usgs":true,"family":"Holcomb","given":"R.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":262540,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":68650,"text":"ha553 - 1976 - Water resources of the Des Moines River Watershed, southwestern Minnesota","interactions":[{"subject":{"id":44064,"text":"ofr74340 - 1974 - Water resources of the Des Moines River watershed, southwestern Minnesota","indexId":"ofr74340","publicationYear":"1974","noYear":false,"title":"Water resources of the Des Moines River watershed, southwestern Minnesota"},"predicate":"SUPERSEDED_BY","object":{"id":68650,"text":"ha553 - 1976 - Water resources of the Des Moines River Watershed, southwestern Minnesota","indexId":"ha553","publicationYear":"1976","noYear":false,"title":"Water resources of the Des Moines River Watershed, southwestern Minnesota"},"id":1}],"lastModifiedDate":"2021-11-12T19:55:11.918985","indexId":"ha553","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":318,"text":"Hydrologic Atlas","code":"HA","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"553","title":"Water resources of the Des Moines River Watershed, southwestern Minnesota","docAbstract":"The Des Moines River drains about 1,350 square miles (3,496 km2) of the north, west, and central parts of the watershed, and the East Fork Des Moines River along with several small creeks drain about 200 square miles (518 km2) in the east part. These tributaries join the Des Moines river in Iowa.
\nThe watershed is on the Coteau des Prairies, the most prominent upland in southern Minnesota. the Coteau rises to altitudes of more than 1,900 feet (579 m) within the watershed. The west boundary is along the crest of the Coteau and was formed by a terminal moraine during late Wisconsin Glaciation. This moraine forms part of the divide between the Mississippi and Missouri Rivers. The north and east boundaries are also formed by morainic highs which represent recessions of the Des Moines lobe during late Wisconsin Glaciation. Surficial materials consist mostly of clayey drift with a few surficial outwash (sand and gravel) areas near the streams.
\nTopographic quadrangle maps published by the U.S. Geological Survey are available for the entire watershed.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ha553","collaboration":"Prepared in cooperation with the Minnesota Department of Natural Resources Division of Waters, Soils, and Minerals","usgsCitation":"Anderson, H., Broussard, W., Farrell, D., and Hult, M.F., 1976, Water resources of the Des Moines River Watershed, southwestern Minnesota: U.S. Geological Survey Hydrologic Atlas 553, 3 Plates: 45.00 x 40.00 inches or smaller, https://doi.org/10.3133/ha553.","productDescription":"3 Plates: 45.00 x 40.00 inches or smaller","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":392,"text":"Minnesota Water Science 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W.L.","contributorId":35334,"corporation":false,"usgs":true,"family":"Broussard","given":"W.L.","email":"","affiliations":[],"preferred":false,"id":626460,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Farrell, D.F.","contributorId":91163,"corporation":false,"usgs":true,"family":"Farrell","given":"D.F.","email":"","affiliations":[],"preferred":false,"id":626461,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hult, M. F.","contributorId":29817,"corporation":false,"usgs":true,"family":"Hult","given":"M.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":626462,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":65172,"text":"i854C - 1976 - Map showing slope stability in western Whatcom County, Washington","interactions":[],"lastModifiedDate":"2025-08-13T16:50:11.120268","indexId":"i854C","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"854","chapter":"C","title":"Map showing slope stability in western Whatcom County, Washington","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/i854C","usgsCitation":"Easterbrook, D.J., 1976, Map showing slope stability in western Whatcom County, Washington: U.S. Geological Survey IMAP 854, 1 Plate: 48.08 x 27.78 inches, https://doi.org/10.3133/i854C.","productDescription":"1 Plate: 48.08 x 27.78 inches","costCenters":[],"links":[{"id":255321,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/imap/0854c/report-thumb.jpg"},{"id":255320,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/imap/0854c/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":255319,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/imap/0854c/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":494029,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_9726.htm","linkFileType":{"id":5,"text":"html"}}],"scale":"62500","country":"United States","state":"Washington","county":"Whatcom County","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -122,\n 48.625\n ],\n [\n -122,\n 49\n ],\n [\n -122.833,\n 49\n ],\n [\n -122.833,\n 48.625\n ],\n [\n -122,\n 48.625\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b12e4b07f02db6a2a47","contributors":{"authors":[{"text":"Easterbrook, D. J.","contributorId":55089,"corporation":false,"usgs":true,"family":"Easterbrook","given":"D.","middleInitial":"J.","affiliations":[],"preferred":false,"id":272778,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":68405,"text":"ha550 - 1976 - Water resources of south-central Missouri","interactions":[],"lastModifiedDate":"2012-02-10T00:11:14","indexId":"ha550","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":318,"text":"Hydrologic Atlas","code":"HA","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"550","title":"Water resources of south-central Missouri","docAbstract":"This atlas describes hydrology in an area of approximately 23 ,000 sq mi and includes all or parts of 38 counties in Missouri. The area is bounded on the north by the southern edge of the Missouri River flood plain, on the east by the Mississippi River and the Plateaus-Lowlands boundary (Ozark Escarpment), on the south by the Missouri-Arkansas State line, and on the west by the western drainage divides of the Gasconade and White River basins. The alluvial valley of the Missouri River is excluded. Although the populations of several rural counties in the area have declined in recent years, significant population increases have occurred in the vicinity of the two principal population centers, St. Louis in the northeast and Springfield in the southwest. Future population increases are expected to occur as a result of continued urban expansion, increased recreational use of land and water resources, and additional development of the mining industry. (Woodard-USGS)","language":"ENGLISH","doi":"10.3133/ha550","usgsCitation":"Gann, E.E., Harvey, E.J., and Miller, D.E., 1976, Water resources of south-central Missouri: U.S. Geological Survey Hydrologic Atlas 550, 19 maps on 4 sheets :col. ;127 x 108 or smaller fold. in envelope 30 x 24 cm., https://doi.org/10.3133/ha550.","productDescription":"19 maps on 4 sheets :col. ;127 x 108 or smaller fold. in envelope 30 x 24 cm.","costCenters":[],"links":[{"id":189906,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":89917,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/ha/550/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":89918,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/ha/550/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":89919,"rank":402,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/ha/550/plate-3.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":89920,"rank":403,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/ha/550/plate-4.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"1000000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -94,36.083333333333336 ], [ -94,39 ], [ -90,39 ], [ -90,36.083333333333336 ], [ -94,36.083333333333336 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49e0e4b07f02db5e3dcf","contributors":{"authors":[{"text":"Gann, E. E.","contributorId":71562,"corporation":false,"usgs":true,"family":"Gann","given":"E.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":278161,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Harvey, Edward Joseph","contributorId":32131,"corporation":false,"usgs":true,"family":"Harvey","given":"Edward","email":"","middleInitial":"Joseph","affiliations":[],"preferred":false,"id":278160,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Miller, Don E.","contributorId":29485,"corporation":false,"usgs":true,"family":"Miller","given":"Don","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":278159,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":59097,"text":"mf797 - 1976 - Isopach map and cross section of the Mahogany zone of the Green River Formation derived principally from geophysical well logs, eastern Uinta Basin, Utah and Colorado","interactions":[],"lastModifiedDate":"2025-05-15T19:49:09.35955","indexId":"mf797","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"797","title":"Isopach map and cross section of the Mahogany zone of the Green River Formation derived principally from geophysical well logs, eastern Uinta Basin, Utah and Colorado","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf797","usgsCitation":"Cashion, W.B., and Dixon, G., 1976, Isopach map and cross section of the Mahogany zone of the Green River Formation derived principally from geophysical well logs, eastern Uinta Basin, Utah and Colorado: U.S. Geological Survey Miscellaneous Field Studies Map 797, 1 Plate: 31.00 x 26.00 inches, https://doi.org/10.3133/mf797.","productDescription":"1 Plate: 31.00 x 26.00 inches","costCenters":[],"links":[{"id":183994,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":88605,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1976/0797/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":486017,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_3968.htm","linkFileType":{"id":5,"text":"html"}}],"scale":"253000","country":"United States","state":"Colorado, Utah","otherGeospatial":"eastern Uinta Basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -109.873,\n 40.198\n ],\n [\n -109.873,\n 39.7786\n ],\n [\n -109,\n 39.7786\n ],\n [\n -109,\n 40.198\n ],\n [\n -109.873,\n 40.198\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aa7e4b07f02db66714e","contributors":{"authors":[{"text":"Cashion, W. B.","contributorId":75525,"corporation":false,"usgs":true,"family":"Cashion","given":"W.","middleInitial":"B.","affiliations":[],"preferred":false,"id":261413,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dixon, G. H.","contributorId":67494,"corporation":false,"usgs":true,"family":"Dixon","given":"G. H.","affiliations":[],"preferred":false,"id":261412,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":7895,"text":"ofr76786 - 1976 - The Lisburne Group: A potential major hydrocarbon objective of the Arctic Slope, Alaska","interactions":[{"subject":{"id":7895,"text":"ofr76786 - 1976 - The Lisburne Group: A potential major hydrocarbon objective of the Arctic Slope, Alaska","indexId":"ofr76786","publicationYear":"1976","noYear":false,"title":"The Lisburne Group: A potential major hydrocarbon objective of the Arctic Slope, Alaska"},"predicate":"SUPERSEDED_BY","object":{"id":70046178,"text":"70046178 - 1977 - Lisburne Group (Mississippian and Pennsylvanian), potential major hydrocarbon objective of Arctic Slope, Alaska","indexId":"70046178","publicationYear":"1977","noYear":false,"title":"Lisburne Group (Mississippian and Pennsylvanian), potential major hydrocarbon objective of Arctic Slope, Alaska"},"id":1}],"supersededBy":{"id":70046178,"text":"70046178 - 1977 - Lisburne Group (Mississippian and Pennsylvanian), potential major hydrocarbon objective of Arctic Slope, Alaska","indexId":"70046178","publicationYear":"1977","noYear":false,"title":"Lisburne Group (Mississippian and Pennsylvanian), potential major hydrocarbon objective of Arctic Slope, Alaska"},"lastModifiedDate":"2025-11-14T14:20:09.850887","indexId":"ofr76786","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-786","title":"The Lisburne Group: A potential major hydrocarbon objective of the Arctic Slope, Alaska","docAbstract":"The Lisburne Group, a thick carbonate rock unit of Mississippian and Pennsylvanian age, is one of the most widespread potential reservoir rock units in northern Alaska. A comprehensive review of the Lisburne in the subsurface of the eastern Arctic Slope indicates attractive reservoir characteristics in a favorable source and migration setting where numerous trapping mechanisms appear to be available. Evaluation of this group as a potential exploration objective is particularly timely in view of impending offshore sales in the Beaufort Sea and current exploration programs underway in the Prudhoe Bay area and the Naval Petroleum Reserve.
Dolomite and sandstone have been identified as reservoir rocks. Oolitic grainstone is a common rock type, but all observations to date indicate little reservoir potential owing to complete void filling by calcite cement. The most important reservoir rock as judged by thickness, areal extent, and predictability is microsucrosic (10-30 μ) dolomite of intertidal to supratidal origin. It is present throughout the Lisburne and is most abundant near the middle of the sequence. Northward it decreases in thickness from 1,000 feet (300 m) to less than 100 feet (30 m). Porosity of the dolomite as determined in selected wells averages between 10 and 15 percent and attains a maximum of slightly more than 25 percent. Net thickness of reservoir rocks (i.e., rocks with greater than 5 percent porosity) varies in these wells from 140 feet (40 m) to 390 feet (120 m). Oil shows are common, and drill-stem tests have yielded as much as 1,600 bbls/day oil and 22 MMcf/day gas in the Lisburne pool of the Prudhoe Bay Field and as much as 2,057 bbls/day saltwater outside the field area. The occurrence of dolomite over such a large area makes its presence in the offshore Beaufort Sea and adjacent Naval Petroleum Reserve No. 4 fairly certain. The occurrence of sandstone as thick as 140 feet (40 m) in the middle and upper part of the Lisburne in two coastal wells suggests that larger areas of sandstone may be found to the north in offshore areas. Shows of oil and gas and a saltwater flow of 1,470 bbls/day have been recorded from this sandstone facies.
Shales of Permian and Cretaceous age unconformably overlie the Lisburne, providing adequate sealing beds above potential reservoirs. Impermeable limestone (completely cemented grainstone) and thin beds of shale may serve as seals within the Lisburne, but the possibility of fractures in these units may negate their sealing capability.
The most favorable source rock for Lisburne hydrocarbons appears to be Cretaceous shale that unconformably overlies the Lisburne east of Prudhoe Bay. This shale is reported by Morgridge and Smith (1972) to be a rich source rock and is the most likely source for the entire Prudhoe Bay Field. A source within the Lisburne or within the underlying Kayak Shale is postulated to explain oil shows in the southernmost Lisburne wells. This postulated source may be in a more basinal facies of the Lisburne and may be similar to dark shale in the upper Lisburne found in thrust slides in the Brooks-Range. Coal in the underlying Endicott Group is a possible source for dry gas. It is inferred that at the present time much of this coal is in a gas—generating regime downdip from the Prudhoe Bay Field area.
Stratigraphic traps involving the Lisburne Group may exist as a result of widespread Permian and Cretaceous unconformities. Structural traps related to normal faulting may occur along the trend of the Barrow Arch, and faulted anticlines are numerous in the foothills of the Brooks Range. Combination traps are possible along the trend of the Barrow Arch at places where both stratigraphic and structural trap might exist.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr76786","usgsCitation":"Bird, K.J., and Jordan, C.F., 1976, The Lisburne Group: A potential major hydrocarbon objective of the Arctic Slope, Alaska: U.S. Geological Survey Open-File Report 76-786, 45 p., https://doi.org/10.3133/ofr76786.","productDescription":"45 p.","costCenters":[{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"links":[{"id":140044,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1976/0786/report-thumb.jpg"},{"id":427884,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1976/0786/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Alaska","otherGeospatial":"Arctic Slope","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -167.79230672684753,\n 70.95128032471553\n ],\n [\n -167.79230672684753,\n 68.64028489549236\n ],\n [\n -143.12168301430032,\n 68.64028489549236\n ],\n [\n -143.12168301430032,\n 70.95128032471553\n ],\n [\n -167.79230672684753,\n 70.95128032471553\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac8e4b07f02db67bc1b","contributors":{"authors":[{"text":"Bird, Kenneth J. kbird@usgs.gov","contributorId":1015,"corporation":false,"usgs":true,"family":"Bird","given":"Kenneth","email":"kbird@usgs.gov","middleInitial":"J.","affiliations":[{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"preferred":true,"id":156799,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Jordan, Clifton F.","contributorId":95203,"corporation":false,"usgs":true,"family":"Jordan","given":"Clifton","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":156800,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":2688,"text":"wsp1798O - 1976 - Sediment characteristics of streams in the eastern Piedmont and western Coastal Plain regions of North Carolina","interactions":[],"lastModifiedDate":"2019-12-30T10:11:16","indexId":"wsp1798O","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":341,"text":"Water Supply Paper","code":"WSP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1798","chapter":"O","title":"Sediment characteristics of streams in the eastern Piedmont and western Coastal Plain regions of North Carolina","docAbstract":"The sediment-transport characteristics of streams were determined in a 15,500-square-kilometre (6,000-square-mile) area of the Coastal Plain and Piedmont regions of eastern North Carolina during 1969-73. The study covered all or parts of 21 counties and included data for 28 sediment-sampling stations in parts of 4 major river basins?the Roanoke, Pamlico, Neuse, and Cape Fear. Annual suspended-sediment yields ranged from 117 to 4.2 tonnes per square kilometre (333 to 12 tons per square mile). Streams in the Piedmont region have the highest yields. Suspended-sediment yield decreases in an eastward direction from the Piedmont to the Coastal Plain region.\r\n\r\nSediment characteristics are directly affected by topography, storm runoff, geology, land use, and man-made detention structures. At one sampling station in the 1973 water year 44 percent of the suspended sediment tonnage was transported during 34 days of high flow. In the Piedmont region, sediment yields vary indirectly with the percentage of forest cover in the basin, but there appears to be no definite relationship between forest cover and sediment yield in the Coastal Plain region. Large lakes act as sediment-detention reservoirs. Average annual sediment yields ranged from 34 to 117 tonnes per square kilometre (98 to 333 tons per square mile) for 3 headwater streams which flow into Hyco Lake in Person County; however, the yield for the station less than 3.2 kilometres (2 miles) downstream from Hyco Dam was about 4.2 tonnes per square kilometre (12 tons per square mile).\r\n\r\nMost suspended sediment during floods in Piedmont streams ranges in size from sand to silt, whereas the suspended material in flooding streams in the Coastal Plain is generally clay size.","language":"English","publisher":"U.S. Government Printing Office","doi":"10.3133/wsp1798O","usgsCitation":"Simmons, C.E., 1976, Sediment characteristics of streams in the eastern Piedmont and western Coastal Plain regions of North Carolina: U.S. Geological Survey Water Supply Paper 1798, vi, 32 p., https://doi.org/10.3133/wsp1798O.","productDescription":"vi, 32 p.","costCenters":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":138801,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wsp/1798o/report-thumb.jpg"},{"id":29045,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wsp/1798o/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"North Carolina","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -80.92529296875,\n 35.24561909420681\n ],\n [\n -77.178955078125,\n 35.24561909420681\n ],\n [\n -77.178955078125,\n 36.55377524336089\n ],\n [\n -80.92529296875,\n 36.55377524336089\n ],\n [\n -80.92529296875,\n 35.24561909420681\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b06e4b07f02db69a136","contributors":{"authors":[{"text":"Simmons, Clyde E.","contributorId":71528,"corporation":false,"usgs":true,"family":"Simmons","given":"Clyde","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":145610,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":4231,"text":"cir734 - 1976 - The Alaskan Mineral Resource Assessment Program: Background information to accompany folio of geologic and mineral resource maps of the Tanacross quadrangle, Alaska","interactions":[],"lastModifiedDate":"2021-10-28T21:16:16.877528","indexId":"cir734","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"734","title":"The Alaskan Mineral Resource Assessment Program: Background information to accompany folio of geologic and mineral resource maps of the Tanacross quadrangle, Alaska","docAbstract":"The Tanacross quadrangle, consisting of 17,400 km 2 (6,700 mi 2) in east-central Alaska, was investigated by an interdisciplinary research team for the purpose of assessing the mineral resource potential of the quadrangle. This report provides the background information for a folio of maps on the geology, geophysics, reconnaissance geochemistry, Landsat imagery, and mineral resource evaluation of the quadrangle. Revisions to the previously published geologic map of the Tanacross quadrangle, 18 new potassium-argon ages, and a comprehensive bibliography are also included.","language":"English","publisher":"U.S. Geological Survey,","doi":"10.3133/cir734","usgsCitation":"Foster, H.L., Albert, N.R., Barnes, D., Curtin, G., Griscom, A., Singer, D., and Smith, J., 1976, The Alaskan Mineral Resource Assessment Program: Background information to accompany folio of geologic and mineral resource maps of the Tanacross quadrangle, Alaska: U.S. Geological Survey Circular 734, iv, 23 p., https://doi.org/10.3133/cir734.","productDescription":"iv, 23 p.","costCenters":[],"links":[{"id":31345,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1976/0734/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":139309,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/1976/0734/report-thumb.jpg"},{"id":391119,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_24019.htm"}],"country":"United States","state":"Alaska","otherGeospatial":"Tanacross quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -144,\n 64.250\n ],\n [\n -141,\n 64.250\n ],\n [\n -141,\n 63\n ],\n [\n -144,\n 63\n ],\n [\n -144,\n 64.250\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad5e4b07f02db68346d","contributors":{"authors":[{"text":"Foster, Helen Laura","contributorId":21936,"corporation":false,"usgs":true,"family":"Foster","given":"Helen","email":"","middleInitial":"Laura","affiliations":[],"preferred":false,"id":148490,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Albert, N. R. D.","contributorId":63789,"corporation":false,"usgs":true,"family":"Albert","given":"N.","email":"","middleInitial":"R. D.","affiliations":[],"preferred":false,"id":148494,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Barnes, D.F.","contributorId":48960,"corporation":false,"usgs":true,"family":"Barnes","given":"D.F.","email":"","affiliations":[],"preferred":false,"id":148493,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Curtin, G.C.","contributorId":89501,"corporation":false,"usgs":true,"family":"Curtin","given":"G.C.","email":"","affiliations":[],"preferred":false,"id":148496,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Griscom, Andrew","contributorId":23520,"corporation":false,"usgs":true,"family":"Griscom","given":"Andrew","email":"","affiliations":[],"preferred":false,"id":148491,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Singer, D.A.","contributorId":69128,"corporation":false,"usgs":true,"family":"Singer","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":148495,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Smith, James G.","contributorId":44534,"corporation":false,"usgs":true,"family":"Smith","given":"James G.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":false,"id":148492,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":26987,"text":"wri7653 - 1976 - Waterlogging in an alluvial aquifer near Lake Minnequa, Pueblo, Colorado","interactions":[],"lastModifiedDate":"2022-09-06T21:50:04.156263","indexId":"wri7653","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"76-53","title":"Waterlogging in an alluvial aquifer near Lake Minnequa, Pueblo, Colorado","docAbstract":"The Lake Minnequa area, located immediately south of the Arkansas River near Pueblo, Colo., is mantled with as much as 46 feet (14 meters) of alluvium covering bedrock of Pierre Shale and Niobrara Formation. Surface water enters the area by the Minnequa Canal and the St. Charles Flood Ditch. The water is stored in Lake Minnequa and other reservoirs. Seepage from St. Charles Reservoirs No. 2 and No. 3 is the major source of water to the alluvial aquifer. The depth of the water table ranges from 0 to 40 feet (0 to 12.2 meters). An 0.5-square-mile (1.3-square-kilometer) area immediately south of Lake Minnequa has a water table less than 6 feet (1.8 meters) below land surface. Lake Minnequa is the principal cause of the shallow water table and resulting waterlogged soil. The bedrock hill east of Lake Minnequa and ground-water flow also contribute to the problem. To eliminate the waterlogging problem, the water table would have to be at least 6 feet (1.8 meters) below land surface. Possible alternatives for eliminating the problem include lowering the water level in Lake Minnequa, placing a network of dewatering wells, or constructing a drainage system in the waterlogged area. (Woodard-USGS)","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri7653","usgsCitation":"Emmons, P.J., 1976, Waterlogging in an alluvial aquifer near Lake Minnequa, Pueblo, Colorado: U.S. Geological Survey Water-Resources Investigations Report 76-53, iv, 34 p., https://doi.org/10.3133/wri7653.","productDescription":"iv, 34 p.","costCenters":[],"links":[{"id":55874,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1976/0053/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":123304,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1976/0053/report-thumb.jpg"},{"id":406280,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_35069.htm","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Colorado","city":"Pueblo","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -104.72442626953124,\n 38.13023573104302\n ],\n [\n -104.59945678710936,\n 38.13023573104302\n ],\n [\n -104.59945678710936,\n 38.28670289852796\n ],\n [\n -104.72442626953124,\n 38.28670289852796\n ],\n [\n -104.72442626953124,\n 38.13023573104302\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e47d9e4b07f02db4b5cc0","contributors":{"authors":[{"text":"Emmons, Patrick J.","contributorId":48958,"corporation":false,"usgs":true,"family":"Emmons","given":"Patrick","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":197363,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":6145,"text":"pp938 - 1976 - Platinum deposits of the Goodnews Bay district, Alaska","interactions":[],"lastModifiedDate":"2025-05-23T18:41:52.62197","indexId":"pp938","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"938","title":"Platinum deposits of the Goodnews Bay district, Alaska","docAbstract":"Platinum placers were discovered in 1926 in a small area south of Goodnews Bay, in southwestern Alaska. Beginning in 1927, the placers were worked for 7 years by small-scale mining methods; in later years dragline excavators and a dredge were utilized. These deposits are important, not only because they are of high grade but because they are the only commercial source of platinum metals in the United States.
The bedded rocks of this area are sedimentary and volcanic rocks of late Paleozoic(?) age that have been intruded by a variety of ultrabasic rocks. The platinum metals of the placers have been derived from a mass of dunite and related rocks that constitute the bedrock of Red Mountain in the upper valley of the Salmon River. The western headwater tributaries of this stream are the fluvial conduits that have produced all the placers in the valley of the river.
The principal placers lie in two pay streaks, one in the valley floor of the Salmon River and the other in an ancient stream channel along the east side of this valley. The stream-channel deposit, called the bench pay streak, was formed in early Pleistocene time; its alluvial materials consist largely of clay derived from an ancient moraine believed to be of Nebraskan age. The valley-floor deposit, called the pay streak of the valley floor, consists of alluvial materials of fluvial and glaciofluvial origin whose ages range from Yarmouth to Holocene. Both channels contain high-grade placers that have yielded a large volume of platinum metals.
The platinum metals of these deposits are contained mainly in two alloys intergrown in a pseudoeutectic fabric. The major alloy is mainly platinum, with a small amount of iridium, still smaller amounts of rhodium and palladium, and probably some osmium and ruthenium. The minor alloy is dominantly iridium and osmium with less platinum and still less ruthenium and rhodium. The compositions of these two alloys are somewhat variable but tend to approach constant mean values. A small amount of free gold is recovered with the platinum metals. In addition to these two alloys, minute amounts of five platinum minerals have been identified. The weighted mean percentages of platinum, iridium, osmium, ruthenium, rhodium, palladium, and gold, as mined from 1936 to 1972, are respectively 82.25, 11.32, 2.15, 0.17, 1.30, 0.38, and 2.43.
The lodes from which these placers have been derived are, or have been, localized in the Red Mountain ridge, where the principal rocks are dunite and serpentinite. No lodes have been recognized, either because the platinum metals are sparsely distributed or because a large part of the platiniferous rock has been eroded. It is known, however, that the amounts of iridium, osmium, and ruthenium, or of osmiridium, decrease from south to north. Other generalizations regarding the composition and granularity of these metals have been deduced. The size and shape of the platinum lodes may have ranged from diffuse disseminations to high-grade concentrations in small loci. Under certain assumptions, the tenor of platinum metals in the dunite can be roughly approximated. Utilizing two totally different methods of computation, the mean tenor has been estimated to lie between 0.19 and 0.27 grain of platinum metals per cubic yard of dunite, or 0.014 to 0.023 gram per stere. No large low-grade deposits of commercial value are likely to be found, but it is possible that some small high-grade concentrations occur.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/pp938","usgsCitation":"Mertie, J.B., 1976, Platinum deposits of the Goodnews Bay district, Alaska: U.S. Geological Survey Professional Paper 938, iv, 42 p., https://doi.org/10.3133/pp938.","productDescription":"iv, 42 p.","costCenters":[],"links":[{"id":486535,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_5112.htm","linkFileType":{"id":5,"text":"html"}},{"id":418479,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/0938/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":140358,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/pp/0938/report-thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Goodnews Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -162.94921875,\n 59.84481485969105\n ],\n [\n -161.8505859375,\n 59.84481485969105\n ],\n [\n -161.8505859375,\n 60.413852350464914\n ],\n [\n -162.94921875,\n 60.413852350464914\n ],\n [\n -162.94921875,\n 59.84481485969105\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad9e4b07f02db684f72","contributors":{"authors":[{"text":"Mertie, John Beaver Jr.","contributorId":91093,"corporation":false,"usgs":true,"family":"Mertie","given":"John","suffix":"Jr.","email":"","middleInitial":"Beaver","affiliations":[],"preferred":false,"id":152192,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":9231,"text":"ofr76753 - 1976 - Volcanic rocks of the McDermitt Caldera, Nevada-Oregon","interactions":[],"lastModifiedDate":"2022-09-28T19:12:21.335316","indexId":"ofr76753","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-753","title":"Volcanic rocks of the McDermitt Caldera, Nevada-Oregon","docAbstract":"The McDermitt caldera, a major Miocene eruptive center is locatedin the northernmost Great Basin directly west of McDermitt, Nev. The alkali rhyolite of Jordan Meadow was erupted from the caldera and covered an area of about 60,000 sq km; the volume of rhyolite is about 960 cubic km.
Paleozoic and Mesozoic sedimentary rocks and Mesozoic granodiorite form the pre-Tertiary Basement in this area. Overlying these is a series of volcanic rocks, probably all of Miocene age. The lowest is a dacite welded tuff, a reddish-brown rock featuring abundant phenocrysts of plagioclase, hornblende, and biotite; next is a heterogeneous unit consisting of mocks ranging from basalt to dacite.
Overlying these is the basalt and andesite of Orevada View, over 700 m thick and consisting of a basal unit of cinder agglutinate overlain by basalt and andesite, much of which contains conspicuous large plagioclase phenocrysts.
Near Disaster Peak and Orevada View, the basalt and andesite are overlain by additional units of silicic volcanic rocks. The lower alkali rhyolite welded tuff contains abundant phenocrysts of alkali feldspar and has a vitric phase with obvious pumice and shard texture. The rhyolite of Little Peak consists of a wide variety of banded flows or welded ruffs and breccias, mostly containing abundant alkali feldspar phenocrysts. It extends south from Disaster Peak and apparently underlies the alkali rhyolite of Jordan Meadow. The quartz latite of Sage Creek lies north of Disaster Peak and consists mostly of finely mottled quartz latite with sparse minute plagioclase phenocrysts.
Volcanic rock units in the east part of the area near the Cordero mine include trachyandesite, quartz labile of McConnell Canyon, and rhyolite of McCormick Ranch. The trachyandesite is dark gray and contains less than 1 percent microphenocrysts plagioclase. It is the lowest unit exposed and may correlate with part of the basalt and andesite of Orevada View. The quartz latite of McConnell Canyon is olive gray and contains about 8 percent plagioclase phenocrysts. It has an upper phase of black vitrophyre which directly underlies The alkali rhyolite of Jordan Meadow. The rhyolite of McCormick Ranch is present farther north and consists of pinkish rhyolite with small amounts of phenocrysts of alkali feldspar, quartz, and plagioclase.
The alkali rhyolite of Jordan Meadow consists of interlayered aphyric, sparsely porphyritic, and abundantly porphyritic alkali rhyolites whose colors are predominantly light gray, greenish gray, and brown, respectively. Phenocrysts are alkali feldspar (to 15 percent) locally with quartz. Sections inside the caldera are as much as 360 m thick and consist of intimately interlayered gray, green, and brown alkali rhyolites commonly flow folded. Outside the caldera sections are equally thick in the south and southwest, but thinner to the north; in these places units of similar lithology are persistent for many kilometers, and flow folding is rare.
A basal green porphyritic unit north of the caldera contains definite shard texture, but elsewhere this feature is rare. Nevertheless, the great lateral extent and relative thinness of the alkali rhyolite of Jordan Meadow suggests that it is welded ash-flow tuff.
Overlying the alkali rhyolite of Jordan Meadow within the McDermitt caldera are four units of lavas. The rhyolite of Hoppin Peaks contains light-brownish-gray rhyolite and black vitophyre, all with sparse phenocrysts of alkali feldspar, quartz, and plagioclase. The rhyolite of McDermitt Creek is greenish or brownish gray and contains abundant phenocrysts of plagioclase. It .is in part structureless and in part flow banded. Alkali rhyolite of Washburn Creek is light gray and contains 0-5 percent phenocrysts alkali feldspar. Quartz labile of Black Mountain forms four isolated remnants of volcanoes in the south part of the caldera. It is brown where well crystallized and black where vitric and contains 5-15 percent plagioclase phenocrysts.
A unit of tuffaceous sedimentary rocks in part fills the caldera. A single occurrence of andesite is interbedded.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr76753","usgsCitation":"Greene, R.C., 1976, Volcanic rocks of the McDermitt Caldera, Nevada-Oregon: U.S. Geological Survey Open-File Report 76-753, Report: v, 80 p.; 2 Plates: 15.01 × 11.06 inches and 11.12 × 14.10 inches, https://doi.org/10.3133/ofr76753.","productDescription":"Report: v, 80 p.; 2 Plates: 15.01 × 11.06 inches and 11.12 × 14.10 inches","costCenters":[],"links":[{"id":407535,"rank":2,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_15416.htm","linkFileType":{"id":5,"text":"html"}},{"id":36875,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1976/0753/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":36874,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1976/0753/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":36873,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1976/0753/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":141755,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1976/0753/report-thumb.jpg"}],"country":"United States","state":"Nevada, Oregon","otherGeospatial":"McDermitt Caldera","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -118.5,\n 41.417\n ],\n [\n -117.75,\n 41.417\n ],\n [\n -117.75,\n 42.417\n ],\n [\n -118.5,\n 42.417\n ],\n [\n -118.5,\n 41.417\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a0de4b07f02db5fd858","contributors":{"authors":[{"text":"Greene, Robert C.","contributorId":36108,"corporation":false,"usgs":true,"family":"Greene","given":"Robert","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":159323,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":9395,"text":"ofr76844 - 1976 - Preliminary summary of the 1976 Atlantic Margin Coring Project of the U.S. Geological Survey","interactions":[],"lastModifiedDate":"2017-11-05T09:51:59","indexId":"ofr76844","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-844","title":"Preliminary summary of the 1976 Atlantic Margin Coring Project of the U.S. Geological Survey","docAbstract":"The U.S. Geological Survey Atlantic Margin Coring Project, 1976, a 60-day expedition to obtain core samples by drilling beneath the floor of the Continental Shelf and Slope of the eastern United States, was carried out in July, August, and September 1976 aboard D/V GLOMAR CONCEPTION. The coring penetrated as much as 310 meters below the sea floor at 19 sites along the continental margin from Georgia to Georges Bank off New England in water depths ranging from 20 to 300 meters; 1,020 meters of material were recovered in 380 cores, ranging in age from Late Cretaceous to Holocene. One of the major findings was the discovery of relatively fresh water (salinities less than 3 parts per thousand) extending beneath the Continental Shelf as much as 60 nautical miles seaward from the New Jersey coast. Water of about 1 part per thousand salinity was found beneath the shelf more than 7 nautical miles off Ocean City, Maryland and Barnegat Inlet, New Jersey. Analyses for light hydrocarbons in the cores show the highest concentrations (as much as 412,000 ppm) at sites in water depth greater than 200 meters (the shelf-slope break), principally in Pleistocene sediments, although methane concentrations greater than 400,000 ppm also were found in Miocene sediments at one site near the shelf edge. (Woodard-USGS)","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr76844","usgsCitation":"Hathaway, J.C., Schlee, J., Poag, C.W., Valentine, P.C., Weed, E.G., Bothner, M., Kohout, F.A., Manheim, F., Schloam, R., Miller, R., and Schultz, D., 1976, Preliminary summary of the 1976 Atlantic Margin Coring Project of the U.S. Geological Survey: U.S. Geological Survey Open-File Report 76-844, 217 p., https://doi.org/10.3133/ofr76844.","productDescription":"217 p.","costCenters":[],"links":[{"id":142922,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1976/0844/report-thumb.jpg"},{"id":37111,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1976/0844/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b06e4b07f02db69a12f","contributors":{"authors":[{"text":"Hathaway, John Cummins","contributorId":95477,"corporation":false,"usgs":true,"family":"Hathaway","given":"John","email":"","middleInitial":"Cummins","affiliations":[],"preferred":false,"id":159611,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schlee, J.J.","contributorId":23542,"corporation":false,"usgs":true,"family":"Schlee","given":"J.J.","email":"","affiliations":[],"preferred":false,"id":159604,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Poag, C. W.","contributorId":16402,"corporation":false,"usgs":true,"family":"Poag","given":"C.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":159603,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Valentine, P. C.","contributorId":46505,"corporation":false,"usgs":true,"family":"Valentine","given":"P.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":159605,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Weed, Elaine G. A.","contributorId":91496,"corporation":false,"usgs":true,"family":"Weed","given":"Elaine","email":"","middleInitial":"G. A.","affiliations":[],"preferred":false,"id":159610,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Bothner, Michael H. mbothner@usgs.gov","contributorId":139855,"corporation":false,"usgs":true,"family":"Bothner","given":"Michael H.","email":"mbothner@usgs.gov","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":159607,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Kohout, F. A.","contributorId":11593,"corporation":false,"usgs":true,"family":"Kohout","given":"F.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":159602,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Manheim, F.T. 0000-0003-4005-4524","orcid":"https://orcid.org/0000-0003-4005-4524","contributorId":55421,"corporation":false,"usgs":true,"family":"Manheim","given":"F.T.","affiliations":[],"preferred":false,"id":159606,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Schloam, R.","contributorId":71550,"corporation":false,"usgs":true,"family":"Schloam","given":"R.","email":"","affiliations":[],"preferred":false,"id":159608,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Miller, R.E.","contributorId":86754,"corporation":false,"usgs":true,"family":"Miller","given":"R.E.","email":"","affiliations":[],"preferred":false,"id":159609,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Schultz, D.M.","contributorId":98310,"corporation":false,"usgs":true,"family":"Schultz","given":"D.M.","email":"","affiliations":[],"preferred":false,"id":159612,"contributorType":{"id":1,"text":"Authors"},"rank":11}]}} ,{"id":29159,"text":"wri7663 - 1976 - Digital-model analysis to predict water levels in a well field near Columbus, Indiana","interactions":[],"lastModifiedDate":"2018-03-27T12:32:46","indexId":"wri7663","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"76-63","title":"Digital-model analysis to predict water levels in a well field near Columbus, Indiana","docAbstract":"Columbus, Indiana, obtains its water supply from six municipally owned wells southwest of the city. The wells are screened in an outwash sand and gravel aquifer that was deposited by glacial melt water in a preglacial bedrock valley. The well field is midway between the East Fork White River and the western edge of the valley.
A digital model was used to determine the effects of two pumping plans on the outwash sand and gravel aquifer. In pumping plan 1, a continuous pumping rate of 1,400 gallons per minute (88 litres per second) for 10 years in each of the city's six existing wells was simulated with the model. Model results of plan 1 indicate that the water levels in the area of the well field would be lowered more than 20 feet (6 metres) and that drawdowns in the wells would approach 35 feet (11 metres) after 10 years' pumping.
Pumping plan 2 had two stages of pumping. In the first, a continuous pumping rate of 1,400 gallons per minute (88 litres per second) for 5 years in each of the city's six existing wells was simulated with the model; the second stage of pumping plan 2 differed from stage 1 only in that five planned wells were added to the six existing wells. Model results of plan 2 indicate that water levels in the area of the well field would be lowered as much as 40 feet (12 metres). Drawdown at two of the well sites would approach 60 feet (18 metres), leaving less than 15 feet (5 metres) of the initial 70 feet (21 metres) of saturated thickness at the two wells after 10 years' pumping.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Indianapolis, IN","doi":"10.3133/wri7663","collaboration":"Prepared in cooperation with the city of Columbus, Indiana, and Indiana Department of Natural Resources, Division of Water","usgsCitation":"Planert, M., 1976, Digital-model analysis to predict water levels in a well field near Columbus, Indiana: U.S. Geological Survey Water-Resources Investigations Report 76-63, iv, 15 p., https://doi.org/10.3133/wri7663.","productDescription":"iv, 15 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":346,"text":"Indiana Water Science Center","active":true,"usgs":true}],"links":[{"id":352787,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1976/0063/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":159179,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1976/0063/report-thumb.jpg"}],"country":"United States","state":"Indiana","county":"Bartholomew County","city":"Columbus","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-85.6849,39.3505],[-85.6851,39.3387],[-85.6852,39.3274],[-85.6859,39.3197],[-85.6865,39.2621],[-85.6873,39.2476],[-85.6878,39.2009],[-85.6881,39.1746],[-85.688,39.1307],[-85.7989,39.1291],[-85.7988,39.0856],[-85.7983,39.0683],[-85.8048,39.0706],[-85.8173,39.0698],[-85.8238,39.0685],[-85.8286,39.064],[-85.8351,39.0626],[-85.8422,39.0627],[-85.8434,39.0609],[-85.8482,39.0591],[-85.8488,39.0555],[-85.853,39.0546],[-85.8577,39.051],[-85.8625,39.0487],[-85.8631,39.0474],[-85.859,39.0433],[-85.8608,39.041],[-86.08,39.0361],[-86.0805,39.0501],[-86.0809,39.0809],[-86.0831,39.2201],[-86.0836,39.2423],[-86.0854,39.3452],[-86.0247,39.3464],[-85.9902,39.3467],[-85.9812,39.3466],[-85.9521,39.347],[-85.914,39.3472],[-85.7998,39.3507],[-85.6849,39.3505]]]},\"properties\":{\"name\":\"Bartholomew\",\"state\":\"IN\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a82e4b07f02db64ae19","contributors":{"authors":[{"text":"Planert, Michael","contributorId":56659,"corporation":false,"usgs":true,"family":"Planert","given":"Michael","email":"","affiliations":[],"preferred":false,"id":201052,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":14051,"text":"ofr7658 - 1976 - Principal facts for gravity stations in the Nevada portion of the Mariposa 2 degrees sheet","interactions":[],"lastModifiedDate":"2024-02-28T18:35:45.958134","indexId":"ofr7658","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-58","title":"Principal facts for gravity stations in the Nevada portion of the Mariposa 2 degrees sheet","docAbstract":"The northeast corner of the Mariposa 2° topographic sheet occurs within the State of Nevada (fig. 1) and includes parts of Mineral and Esmeralda Counties. In this area field crews of the U.S. Geological Survey have established 95 gravity observations in conjunction with geologic studies being made as part of the Nevada tectonic project. The principal gravity reference base station was Tonopah J, located at the Nye County Airport, 8 miles (12.9 km) east of Tonopah, Nev. The observed gravity value for this base is 979,476.15 mGals (Department of the Air Force, written commun., 1969).
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr7658","usgsCitation":"Healey, D., 1976, Principal facts for gravity stations in the Nevada portion of the Mariposa 2 degrees sheet: U.S. Geological Survey Open-File Report 76-58, 10 p., https://doi.org/10.3133/ofr7658.","productDescription":"10 p.","costCenters":[],"links":[{"id":426080,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1976/0058/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":147142,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1976/0058/report-thumb.jpg"}],"country":"United States","state":"Nevada","county":"Esmeralda County, Mineral County","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -118.43781094436912,\n 38.008977151547384\n ],\n [\n -118.43781094436912,\n 37.40053758365461\n ],\n [\n -117.03156094436906,\n 37.40053758365461\n ],\n [\n -117.03156094436906,\n 38.008977151547384\n ],\n [\n -118.43781094436912,\n 38.008977151547384\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae4e4b07f02db68a38d","contributors":{"authors":[{"text":"Healey, D.L.","contributorId":52964,"corporation":false,"usgs":true,"family":"Healey","given":"D.L.","email":"","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":168852,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":10758,"text":"ofr76393 - 1976 - Statistical analysis of water-level, springflow, and streamflow data for the Edwards Aquifer in south-central Texas","interactions":[],"lastModifiedDate":"2016-08-10T16:31:05","indexId":"ofr76393","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-393","title":"Statistical analysis of water-level, springflow, and streamflow data for the Edwards Aquifer in south-central Texas","docAbstract":"Water-level, springflow, and streamflow data were used to develop simple and multiple linear-regression equations for use in estimating water levels in wells and the flow of three major springs in the Edwards aquifer in the eastern San Antonio area. The equations provide daily, monthly, and annual estimates that compare very favorably with observed data. Analyses of geologic and hydrologic data indicate that the water discharged by the major springs is supplied primarily by regional underflow from the west and southwest and by local recharge in the infiltration area in northern Bexar, Comal, and Hays Counties.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr76393","collaboration":"Prepared by the U.S. Geological Survey in cooperation with the Edwards Underground Water District, the Texas Water Development Board, and the city of San Antonio","usgsCitation":"Puente, C., 1976, Statistical analysis of water-level, springflow, and streamflow data for the Edwards Aquifer in south-central Texas: U.S. Geological Survey Open-File Report 76-393, 58 p., https://doi.org/10.3133/ofr76393.","productDescription":"58 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"links":[{"id":143382,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1976/0393/report-thumb.jpg"},{"id":92271,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1976/0393/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Texas","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -99.0,29.0 ], [ -99.0,30.5 ], [ -97.75,30.5 ], [ -97.75,29.0 ], [ -99.0,29.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699ea9","contributors":{"authors":[{"text":"Puente, Celso","contributorId":36140,"corporation":false,"usgs":true,"family":"Puente","given":"Celso","email":"","affiliations":[],"preferred":false,"id":161912,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":43988,"text":"ofr76683 - 1976 - Time of travel of solutes in the East Fork Trinity River, November 1975; and Elm Fork Trinity River, December 1975; Trinity River basin, Texas","interactions":[],"lastModifiedDate":"2017-06-14T14:01:47","indexId":"ofr76683","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-683","title":"Time of travel of solutes in the East Fork Trinity River, November 1975; and Elm Fork Trinity River, December 1975; Trinity River basin, Texas","docAbstract":"The U.S. Geological Survey, in cooperation with the North Central Texas Council of Governments, the Trinity River Authority of Texas, and the Texas Water Development Board, conducted two time-of-travel studies in the Trinity River basin in November and December, 1975. Field data were collected on the East Fork Trinity River during November 18-22, 1975, and on the Elm Fork Trinity River during December 8-13, 1975. The purpose of these two studies was to provide data that could be used by the Trinity River Authority and the Texas Water Quality Board in the development of a mathematical water-quality model of the two streams. The model is to be used in a comprehensive water-quality management plan for the Trinity River basin.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr76683","issn":"ma","usgsCitation":"Myers, D.R., and Slade, R.M., 1976, Time of travel of solutes in the East Fork Trinity River, November 1975; and Elm Fork Trinity River, December 1975; Trinity River basin, Texas: U.S. Geological Survey Open-File Report 76-683, 3 Plates: 18.13 x 24.06 inches or smaller, https://doi.org/10.3133/ofr76683.","productDescription":"3 Plates: 18.13 x 24.06 inches or smaller","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"links":[{"id":168753,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr76683.PNG"},{"id":326948,"rank":1,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1976/0683/plate-1.pdf","text":"Plate 1","size":"2.63 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Plate 1"},{"id":326949,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1976/0683/plate-2.pdf","text":"Plate 2","size":"2.24 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Plate 2"},{"id":326950,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1976/0683/plate-3.pdf","text":"Plate 3","size":"1.99 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Plate 3"}],"country":"United States","state":"Texas","otherGeospatial":"Trinity River basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -96.51626586914062,\n 32.47964619410741\n ],\n [\n -96.51626586914062,\n 32.759562025650126\n ],\n [\n -96.44622802734375,\n 32.759562025650126\n ],\n [\n -96.44622802734375,\n 32.47964619410741\n ],\n [\n -96.51626586914062,\n 32.47964619410741\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -97.08480834960938,\n 32.864592899813275\n ],\n [\n -97.08480834960938,\n 33.09384260312052\n ],\n [\n -96.87332153320311,\n 33.09384260312052\n ],\n [\n -96.87332153320311,\n 32.864592899813275\n ],\n [\n -97.08480834960938,\n 32.864592899813275\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a53e4b07f02db62b69f","contributors":{"authors":[{"text":"Myers, Dennis R.","contributorId":57860,"corporation":false,"usgs":true,"family":"Myers","given":"Dennis","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":228943,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Slade, Raymond M. Jr.","contributorId":46487,"corporation":false,"usgs":true,"family":"Slade","given":"Raymond","suffix":"Jr.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":228942,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":10137,"text":"ofr76627 - 1976 - Progress report on geology of the Edwards aquifer, San Antonio area, Texas, and preliminary interpretation of borehole geophysical and laboratory data on carbonate rocks","interactions":[],"lastModifiedDate":"2021-12-30T19:19:42.107241","indexId":"ofr76627","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1976","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":"76-627","title":"Progress report on geology of the Edwards aquifer, San Antonio area, Texas, and preliminary interpretation of borehole geophysical and laboratory data on carbonate rocks","docAbstract":"This report describes the geology and porosity of the rocks of the Edwards aquifer, with particular attention to the eastern half of the San Antonio area. The data were obtained from geologic and geophysical studies of nine cored test holes, from laboratory analyses of samples of the aquifer materials, and from recent stratigraphic studies by other investigators.
The Georgetown Formation and the Edwards Group or their equivalent stratigraphic units are extensively exposed in central Texas and they occur in the subsurface throughout southern Texas. They consist of a complex sequence of carbonate rocks deposited during Early Cretaceous time under different depositional conditions. Within the study area, the thickness of the carbonate rocks ranges from less than 400 feet (122 m) in the eastern part of the area to more than 600 feet (183 m) in the southwestern part.
The depositional environments significantly affected the texture and the composition of the sediments. The Maverick Basin in the southwestern part of the study area was a euxinic basin surrounded by a barrier rudistid reef. Fine-grained carbonates and some associated evaporites occur within this basin. The San Marcos Platform in the eastern part of the study area was intermittently submerged by a transgressing continental sea. Much of the sediments are extensively reworked and burrowed by marine organisms. Several thick sequences of dolomites, evaporites, and associated collapsed deposits occur on the San Marcos Platform. The carbonates of the San Marcos Platform are extensively dissolved within the fresh-water zone. Much of the dissolution is selective of beds containing evaporites or porous dolomites.
The dominant structural feature of the study area is a broad homocline that extends from nearly flat-lying beds on the Edwards Plateau to steeply dipping beds of the deep subsurface of the Gulf Coastal Plain. The homocline is interrupted by the Balcones Fault Zone, which is a zone of normal faults that extend across the study area. The intensity and complexity of faulting increases eastward as part of a progression from gentle flexures in the southwestern part of the study area to a complex pattern of tilted fault blocks on the San Marcos Platform.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr76627","collaboration":"Prepared in cooperation with the San Antonio City Water Board and the Texas Water Development Board","usgsCitation":"Maclay, R.W., and Small, T.A., 1976, Progress report on geology of the Edwards aquifer, San Antonio area, Texas, and preliminary interpretation of borehole geophysical and laboratory data on carbonate rocks: U.S. Geological Survey Open-File Report 76-627, Report: 63 p.; 17 Figures: 17.77 x 11.94 inches or smaller, https://doi.org/10.3133/ofr76627.","productDescription":"Report: 63 p.; 17 Figures: 17.77 x 11.94 inches or smaller","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":583,"text":"Texas Water Science 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