{"pageNumber":"4942","pageRowStart":"123525","pageSize":"25","recordCount":165623,"records":[{"id":70188688,"text":"70188688 - 1981 - An informal palynologic zonation for the cretaceous system of the United States mid‐Atlantic (Baltimore canyon area) outer continental shelf","interactions":[],"lastModifiedDate":"2017-06-21T11:31:43","indexId":"70188688","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3006,"text":"Palynology","active":true,"publicationSubtype":{"id":10}},"title":"An informal palynologic zonation for the cretaceous system of the United States mid‐Atlantic (Baltimore canyon area) outer continental shelf","docAbstract":"<p>No abstract available</p>","language":"English","publisher":"Taylor and Francis Group","doi":"10.1080/01916122.1981.9989224","usgsCitation":"Bebout, J.W., 1981, An informal palynologic zonation for the cretaceous system of the United States mid‐Atlantic (Baltimore canyon area) outer continental shelf: Palynology, v. 5, no. 1, p. 159-194, https://doi.org/10.1080/01916122.1981.9989224.","productDescription":"36 p.","startPage":"159","endPage":"194","costCenters":[],"links":[{"id":342711,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","issue":"1","noUsgsAuthors":false,"publicationDate":"2010-08-24","publicationStatus":"PW","scienceBaseUri":"594b85b9e4b062508e382bce","contributors":{"authors":[{"text":"Bebout, John W.","contributorId":79912,"corporation":false,"usgs":true,"family":"Bebout","given":"John","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":698920,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70186530,"text":"70186530 - 1981 - Chrysophyte cysts as potential environmental indicators","interactions":[],"lastModifiedDate":"2017-04-05T10:03:17","indexId":"70186530","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Chrysophyte cysts as potential environmental indicators","docAbstract":"<p><span>Many Chrysophyte algae produce morphologically distinctive, siliceous, microscopic cysts during a resting stage of their life cycles; these cysts are often preserved in sediments. Scanning electron microscopy and Nomarski optics permit much more detailed observation of these cysts than was heretofore possible. We have used an ecologic and biogeographic approach to study the distribution of cyst forms in sediments and have established that many cyst types are found only in specific habitats, such as montane lakes, wet meadows, ephemeral ponds, and </span><i>Sphagnum</i><span> bogs. In the samples we have studied, cysts seem to be most common in fluctuating fresh-water habitats of low to moderate pH and some winter freezing. Numerous taxonomic problems have yet to be resolved. We believe that chrysophyte cysts have the potential to become a useful tool for both modern environmental assessments and paleoecological studies of Cenozoic fresh-water lacustrine deposits.</span></p>","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(1981)92<839:CCAPEI>2.0.CO;2","usgsCitation":"Adam, D.P., and Mahood, A.D., 1981, Chrysophyte cysts as potential environmental indicators: Geological Society of America Bulletin, v. 92, no. 11, p. 839-844, https://doi.org/10.1130/0016-7606(1981)92<839:CCAPEI>2.0.CO;2.","productDescription":"6 p.","startPage":"839","endPage":"844","costCenters":[],"links":[{"id":339192,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58e60287e4b09da6799ac6ff","contributors":{"authors":[{"text":"Adam, David P.","contributorId":36132,"corporation":false,"usgs":true,"family":"Adam","given":"David","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":688615,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mahood, Albert D.","contributorId":97493,"corporation":false,"usgs":true,"family":"Mahood","given":"Albert","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":688616,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70186542,"text":"70186542 - 1981 - Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska","interactions":[],"lastModifiedDate":"2022-12-22T15:32:41.221491","indexId":"70186542","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska","docAbstract":"<p><span>U-Th-Pb analyses of zircons from an ortho-augen gneiss body in the Yukon-Tanana Upland of east-central Alaska yield strong evidence for the presence of early Proterozoic material in this area. U-Pb data define a chord that intersects concordia at about 2,300 and 345 m.y. We consider two interpretations: (1) the protolith was intruded during the Proterozoic and was subsequently metamorphosed in the Paleozoic or, more likely, (2) the protolith was intruded in the Paleozoic and incorporated material of Proterozoic age. An Sm-Nd model age of about 1,900 m.y. on a whole-rock sample of augen gneiss is additional evidence for the presence of Proterozoic material in the gneiss. K-Ar and U-Th-Pb dating of mica and sphene, respectively, reveal that younger thermal events occurred at least as recently as 110 m.y. ago.</span></p>","language":"English","publisher":"Geological Survey of America","doi":"10.1130/0091-7613(1981)9<469:PZFAGY>2.0.CO;2","usgsCitation":"Aleinikoff, J.N., Dusel-Bacon, C., Foster, H.L., and Futa, K., 1981, Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska: Geology, v. 9, no. 10, p. 469-473, https://doi.org/10.1130/0091-7613(1981)9<469:PZFAGY>2.0.CO;2.","productDescription":"5 p.","startPage":"469","endPage":"473","costCenters":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true},{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":339207,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Yukon-Tanana Upland","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -153.02027601699135,\n              66.3079185928409\n            ],\n            [\n              -153.02027601699135,\n              63.24952491845639\n            ],\n            [\n              -140.99256333560837,\n              63.24952491845639\n            ],\n            [\n              -140.99256333560837,\n              66.3079185928409\n            ],\n            [\n              -153.02027601699135,\n              66.3079185928409\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      }\n    }\n  ]\n}","volume":"9","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58e60286e4b09da6799ac6f9","contributors":{"authors":[{"text":"Aleinikoff, John N. 0000-0003-3494-6841 jaleinikoff@usgs.gov","orcid":"https://orcid.org/0000-0003-3494-6841","contributorId":1478,"corporation":false,"usgs":true,"family":"Aleinikoff","given":"John","email":"jaleinikoff@usgs.gov","middleInitial":"N.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":688671,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dusel-Bacon, Cynthia 0000-0001-8481-739X cdusel@usgs.gov","orcid":"https://orcid.org/0000-0001-8481-739X","contributorId":2797,"corporation":false,"usgs":true,"family":"Dusel-Bacon","given":"Cynthia","email":"cdusel@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":688672,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Foster, Helen L.","contributorId":56195,"corporation":false,"usgs":true,"family":"Foster","given":"Helen","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":688673,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Futa, Kiyoto 0000-0001-8649-7510 kfuta@usgs.gov","orcid":"https://orcid.org/0000-0001-8649-7510","contributorId":619,"corporation":false,"usgs":true,"family":"Futa","given":"Kiyoto","email":"kfuta@usgs.gov","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":688674,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70188926,"text":"70188926 - 1981 - United States gold resource profile","interactions":[],"lastModifiedDate":"2017-06-27T15:20:48","indexId":"70188926","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"United States gold resource profile","docAbstract":"<p>No abstract available</p>","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.76.4.937","usgsCitation":"Cargill, S., 1981, United States gold resource profile: Economic Geology, v. 76, no. 4, p. 937-943, https://doi.org/10.2113/gsecongeo.76.4.937.","productDescription":"7 p.","startPage":"937","endPage":"943","costCenters":[],"links":[{"id":343018,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","volume":"76","issue":"4","noUsgsAuthors":false,"publicationDate":"1981-07-01","publicationStatus":"PW","scienceBaseUri":"59536ee2e4b062508e3c7b35","contributors":{"authors":[{"text":"Cargill, S.M.","contributorId":64776,"corporation":false,"usgs":true,"family":"Cargill","given":"S.M.","affiliations":[],"preferred":false,"id":701300,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70186536,"text":"70186536 - 1981 - Deep volcanic tremor and magma ascent mechanism under Kilauea, Hawaii","interactions":[],"lastModifiedDate":"2017-04-05T10:28:53","indexId":"70186536","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Deep volcanic tremor and magma ascent mechanism under Kilauea, Hawaii","docAbstract":"<p><span>Deep harmonic tremor originating at depths around 40 km under Kilauea was studied using records accumulated since 1962 at the Hawaii Volcano Observatory of the U.S. Geological Survey. The deep source of the tremor was determined by onset times and confirmed by the relative amplitude across the island-wide network of seismometers. The period of tremor was conclusively shown to be determined by the source effect and not by the path or station site effect because the period would change considerably in time but maintained uniformity across the seismic net during the tremor episode. The tremor appeared to be primarily composed of </span><i>P</i><span> waves. We interpret the observed period and amplitude in terms of the stationary crack model of Aki et al. (1977) and find that the seismic moment rates for deep tremors are considerably larger than those for shallow-tremors suggesting more vigorous transport for the former. We propose a kinematic source model which may be more appropriate for deep tremor. According to this model, a measurable quantity called ‘reduced displacement’ is directly proportional to the rate of magma flow. A systematic search for deep tremor episodes was made for the period from 1962 through 1979, and the amplitude, period, and duration of the tremor were tabulated. We then constructed a cumulative reduced-displacement plot over the 18-year period. The result shows a generally steady process which does not seem to be significantly affected by major eruptions and large earthquakes near the surface. The total magma flow estimated from the reduced displacement is however, one order of magnitude smaller than that estimated by Swanson (1972). It may be that most channels transport magma aseismically, and only those with strong barriers generate tremor.</span></p>","language":"English","publisher":"Wiley","doi":"10.1029/JB086iB08p07095","usgsCitation":"Aki, K., and Koyanagi, R., 1981, Deep volcanic tremor and magma ascent mechanism under Kilauea, Hawaii: Journal of Geophysical Research B: Solid Earth, v. 86, no. B8, p. 7095-7109, https://doi.org/10.1029/JB086iB08p07095.","productDescription":"15 p.","startPage":"7095","endPage":"7109","costCenters":[],"links":[{"id":339198,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Hawaii","otherGeospatial":"Kilauea","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -159.8675537109375,\n              21.778630076828534\n            ],\n            [\n              -159.17266845703125,\n              21.778630076828534\n            ],\n            [\n              -159.17266845703125,\n              22.328481987166487\n            ],\n            [\n              -159.8675537109375,\n              22.328481987166487\n            ],\n            [\n              -159.8675537109375,\n              21.778630076828534\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"86","issue":"B8","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"58e60287e4b09da6799ac6fb","contributors":{"authors":[{"text":"Aki, Keiiti","contributorId":88790,"corporation":false,"usgs":true,"family":"Aki","given":"Keiiti","email":"","affiliations":[],"preferred":false,"id":688647,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Koyanagi, Robert Y","contributorId":117756,"corporation":false,"usgs":true,"family":"Koyanagi","given":"Robert Y","affiliations":[],"preferred":false,"id":688648,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70188845,"text":"70188845 - 1981 - Comparison of uranium-series, radiocarbon, and amino acid data from marine molluscs, Baffin Island, Arctic Canada","interactions":[],"lastModifiedDate":"2020-10-21T15:49:27.587114","indexId":"70188845","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Comparison of uranium-series, radiocarbon, and amino acid data from marine molluscs, Baffin Island, Arctic Canada","docAbstract":"<p><span>Uranium-series and </span><sup>14</sup><span>C dates and the extent of amino acid racemization are reported for 24 marine shell samples from three areas of Baffin Island, Arctic Canada. When the radiometric dates are plotted against the ratio of D-alloisoleucene:L-isoleucene in the shells, five broad age groups are recognized. The uranium-series data indicate that </span><sup>231</sup><span>Pa is incompletely retained in most fossil shells and that </span><sup>230</sup><span>Th is lost from some of the samples. Therefore, their apparent ages are minimum. However, a few dated samples in each group have yielded useful age results, and the minimum ages of the five groups of samples are estimated as 7,000 to 11,000, ≥ 70,000, ≥ 136,000, ≥ 190,000, and &gt; 300,000 yr. Calculated integrated thermal histories based on the epimerization reaction in the mollusc </span><i>Hiatella arctica</i><span> Linné give paleotemperature estimates of around −5 °C, compared to the present mean annual air temperature of about −11 °C.</span></p>","language":"English","publisher":"Geological Society of America","doi":"10.1130/0091-7613(1981)9<451:COURAA>2.0.CO;2","usgsCitation":"Szabo, B.J., Miller, G.H., Andrews, J.T., and Stuiver, M., 1981, Comparison of uranium-series, radiocarbon, and amino acid data from marine molluscs, Baffin Island, Arctic Canada: Geology, v. 9, no. 10, p. 451-457, https://doi.org/10.1130/0091-7613(1981)9<451:COURAA>2.0.CO;2.","productDescription":"7 p.","startPage":"451","endPage":"457","costCenters":[],"links":[{"id":342867,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Canada","otherGeospatial":"Baffin Island","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  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H.","contributorId":54732,"corporation":false,"usgs":false,"family":"Miller","given":"G.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":700646,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Andrews, J. T.","contributorId":191135,"corporation":false,"usgs":false,"family":"Andrews","given":"J.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":700647,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stuiver, M.","contributorId":54730,"corporation":false,"usgs":true,"family":"Stuiver","given":"M.","affiliations":[],"preferred":false,"id":700648,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70188669,"text":"70188669 - 1981 - Rare-earth element geochemistry of the island-arc volcanic rocks of Rabaul and Talasea, New Britain","interactions":[],"lastModifiedDate":"2017-06-20T17:37:39","indexId":"70188669","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Rare-earth element geochemistry of the island-arc volcanic rocks of Rabaul and Talasea, New Britain","docAbstract":"<p><span>The island-arc volcanic rocks of Rabaul and Talasea, New Britain, range in composition from basalt through rhyolite. Rare-earth elements have been determined by mass-spectrometric isotope dilution in 16 samples. Chondrite-normalized rare-earth element patterns are distinct for each volcanic center, but all are relatively flat (Ce/Yb</span><sub>E.F.</sub><span> = 1.1 to 3.0). Within each center, rare-earth element concentrations increase from basalt to dacite, and Eu anomalies become progressively more negative from basalt to dacite (Eu/Eu* = 1.0 to 0.8). Lavas inferred to contain cumulate phenocrysts show positive Eu anomalies (Eu/Eu* of up to 1.2). The observed variations are consistent with fractional crystallization of basalt or basaltic andesite by removal or accumulation of the observed phenocrysts, including olivine, plagioclase, pyroxene, and opaque minerals. Quantitative trace-element models for Talasea lavas indicate precipitation of 50 wt percent of phenocrysts from basalt to produce andesite and an additional 22 wt percent to produce dacite. A total-equilibrium model provides the best approximation to observed concentrations, implying that the process took place at a depth sufficient to allow slow cooling of the magma as precipitation proceeded. The “least fractionated” basalts and basaltic andesites are similar in rare-earth element pattern to those of corresponding type suites in other oceanic-island arcs, implying a widespread uniformity of source and process in the production of each magma type.</span></p>","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(1981)92<858:REGOTI>2.0.CO;2","usgsCitation":"Arth, J.G., 1981, Rare-earth element geochemistry of the island-arc volcanic rocks of Rabaul and Talasea, New Britain: Geological Society of America Bulletin, v. 92, no. 11, p. 858-863, https://doi.org/10.1130/0016-7606(1981)92<858:REGOTI>2.0.CO;2.","productDescription":"6 p.","startPage":"858","endPage":"863","costCenters":[],"links":[{"id":342690,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594a342be4b062508e36af6d","contributors":{"authors":[{"text":"Arth, Joseph G.","contributorId":104546,"corporation":false,"usgs":true,"family":"Arth","given":"Joseph","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":698855,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188683,"text":"70188683 - 1981 - Water content in Palo Duro salt, Randall and Swisher County cores","interactions":[],"lastModifiedDate":"2017-06-21T10:43:33","indexId":"70188683","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":2,"text":"State or Local Government Series"},"seriesNumber":"81-1","title":"Water content in Palo Duro salt, Randall and Swisher County cores","docAbstract":"<p>No abstract available</p>","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Geology and geohydrology of the Palo Duro Basin, Texas Panhandle: A report on the progress of nuclear waste isolation feasibility studies","largerWorkSubtype":{"id":2,"text":"State or Local Government Series"},"language":"English","publisher":"Texas Bureau of Economic Geology","usgsCitation":"Bassett, R., and Roedder, E., 1981, Water content in Palo Duro salt, Randall and Swisher County cores, i, 4 p.","productDescription":"i, 4 p.","startPage":"119","endPage":"122","costCenters":[],"links":[{"id":342705,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Texas","otherGeospatial":"Palo Duro Basin","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -103.02978515625,\n              33.394759218577995\n            ],\n            [\n              -99.97558593749999,\n              33.394759218577995\n            ],\n            [\n              -99.97558593749999,\n              36.527294814546245\n            ],\n            [\n              -103.02978515625,\n              36.527294814546245\n            ],\n            [\n              -103.02978515625,\n              33.394759218577995\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594b85b9e4b062508e382bd2","contributors":{"authors":[{"text":"Bassett, R.L.","contributorId":13233,"corporation":false,"usgs":true,"family":"Bassett","given":"R.L.","email":"","affiliations":[],"preferred":false,"id":698888,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Roedder, E.","contributorId":100986,"corporation":false,"usgs":true,"family":"Roedder","given":"E.","affiliations":[],"preferred":false,"id":698889,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70188763,"text":"70188763 - 1981 - Lower Eocene alluvial paleosols (Willwood Formation, Northwest Wyoming, U.S.A.) and their significance for paleoecology, paleoclimatology, and basin analysis","interactions":[],"lastModifiedDate":"2017-06-22T17:54:45","indexId":"70188763","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2996,"text":"Palaeogeography, Palaeoclimatology, Palaeoecology","printIssn":"0031-0182","active":true,"publicationSubtype":{"id":10}},"title":"Lower Eocene alluvial paleosols (Willwood Formation, Northwest Wyoming, U.S.A.) and their significance for paleoecology, paleoclimatology, and basin analysis","docAbstract":"<p>The lower Eocene Willwood Formation of northwest Wyoming is a 700 m thick accumulation of alluvial floodplain and channel mudstones and sandstones, nearly all of which show paleopedogenic modifications. Pedogenesis of Willwood sandstones is indicated by taproot and vertebrate and invertebrate bioturbation, early local cementation by calcium carbonate, and thin illuviation cutans on clastic grains. Pedogenesis in Willwood mudstones is indicated by plant bioturbation, insect and other invertebrate burrow casts and lebensspuren; free iron, aluminum, and manganese mobilization, including hydromorphic gleying; sesquioxide and calcareous glaebule formation in lower parts of the solum; presence of clay-rich and organic carbon-rich zones; and well differentiated epipedons and albic and spodic horizons. Probable A horizons are also locally well developed.</p><p>Occurrence of variegated paleosol units in thick floodplain mudstone deposits and their association with thin, lenticular, and unconnected fluvial sandstones in the Willwood Formation of the central and southeast Bighorn Basin suggest that these soils formed during times of rapid sediment accumulation. The tabular geometry and lateral persistence of soil units as well as the absence of catenization indicate that Willwood floodplains were broad and essentially featureless.</p><p>All Willwood paleosols were developed on alluvial parent materials and are complex in that B horizons of younger paleosols were commonly superimposed upon and mask properties of suspected A and B horizons of the next older paleosols. The soils appear to be wet varieties of the Spodosol and Entisol groups (aquods and ferrods, and aquents, respectively), though thick, superposed and less mottled red, purple, and yellow paleosols resemble some ultisols. Most Willwood paleosols resemble warm temperate to subtropical alluvial soils that form today under alternating wet and dry conditions and (or) fluctuating water tables. The up-section decrease in frequency of gley mottles, increase in numerical proportion and thickness of red versus orange coloration, and increase in abundance of calcrete glaebules indicate better drained soils and probably drier climate in late Willwood time. This drying is believed to be related to creation of rain shadows and spacing of rainfall (but not necessarily decrease in absolute rainfall) due to progressive tectonic structural elevation of the mountainous margins of the Bighorn Basin.</p>","language":"English","publisher":"Elsevier","doi":"10.1016/0031-0182(81)90056-0","usgsCitation":"Bown, T.M., and Kraus, M.J., 1981, Lower Eocene alluvial paleosols (Willwood Formation, Northwest Wyoming, U.S.A.) and their significance for paleoecology, paleoclimatology, and basin analysis: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 34, p. 1-30, https://doi.org/10.1016/0031-0182(81)90056-0.","productDescription":"30 p.","startPage":"1","endPage":"30","costCenters":[],"links":[{"id":342802,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Wyoming","otherGeospatial":"Bighorn Basin","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -109.3304443359375,\n              45.00753503123719\n            ],\n            [\n              -109.3359375,\n              44.99199795382439\n            ],\n            [\n              -109.2919921875,\n              44.78183504339988\n            ],\n            [\n              -109.1876220703125,\n              44.56307730757893\n            ],\n            [\n              -109.22607421875,\n              44.42593442145313\n            ],\n            [\n              -109.49523925781249,\n              44.315987905196906\n            ],\n            [\n              -109.4622802734375,\n              44.27273816279087\n            ],\n            [\n              -109.25354003906249,\n              44.327777761284416\n            ],\n            [\n              -109.12170410156249,\n              44.31205742666618\n            ],\n            [\n              -109.1546630859375,\n              44.209772586984485\n            ],\n            [\n              -109.27001953125,\n              44.15068115978094\n            ],\n            [\n              -109.2864990234375,\n              44.09547572946637\n            ],\n            [\n              -109.1326904296875,\n              44.02442151965934\n            ],\n            [\n              -109.0228271484375,\n              44.008620115415354\n            ],\n            [\n              -109.0283203125,\n              43.80678314779554\n            ],\n            [\n              -108.9019775390625,\n              43.691707903073805\n            ],\n            [\n              -108.7591552734375,\n              43.59630591596548\n            ],\n            [\n              -108.34716796875,\n              43.53660274231031\n            ],\n            [\n              -107.7374267578125,\n              43.44494295526125\n            ],\n            [\n              -107.29248046875,\n              43.476840397778936\n            ],\n            [\n              -107.193603515625,\n              43.57243174740972\n            ],\n            [\n              -107.0892333984375,\n              43.695679697898825\n            ],\n            [\n              -107.1221923828125,\n              43.957236472025635\n            ],\n            [\n              -107.24853515625,\n              44.19402066387343\n            ],\n            [\n              -107.4517822265625,\n              44.351350365612326\n            ],\n            [\n              -107.4737548828125,\n              44.44554600843547\n            ],\n            [\n              -107.6385498046875,\n              44.6061127451739\n            ],\n            [\n              -107.9351806640625,\n              44.69989765840318\n            ],\n            [\n              -108.1219482421875,\n              45.131679975460536\n            ],\n            [\n              -108.1878662109375,\n              45.38301927899065\n            ],\n            [\n              -109.017333984375,\n              45.41773242370463\n            ],\n            [\n              -109.18212890625,\n              45.251688256117646\n            ],\n            [\n              -109.3304443359375,\n              45.00753503123719\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"34","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594cd743e4b062508e3951f9","contributors":{"authors":[{"text":"Bown, Thomas M.","contributorId":67081,"corporation":false,"usgs":true,"family":"Bown","given":"Thomas","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":699822,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kraus, M. J.","contributorId":44605,"corporation":false,"usgs":false,"family":"Kraus","given":"M.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":699823,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70193891,"text":"70193891 - 1981 - Organochlorine residues in fish: National Pesticide Monitoring Program, 1970-74","interactions":[],"lastModifiedDate":"2017-11-07T11:53:27","indexId":"70193891","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3038,"text":"Pesticides Monitoring Journal","onlineIssn":" 0031-615","printIssn":" 0031-615","active":true,"publicationSubtype":{"id":10}},"title":"Organochlorine residues in fish: National Pesticide Monitoring Program, 1970-74","docAbstract":"<p><span>As part of the National Pesticide Monitoring Program, the U.S. Fish and Wildlife Service analyzed organochlorine contaminant residues in fish samples collected from about 100 stations each year from 1970 to 1974. During this period, mean residues of DDT and its metabolites declined nationally but remained widespread, and high concentrations continued to be present in areas where DDT use was extensive. Results of interlaboratory crosscheck analyses supported these conclusions, despite interpretation problems posed by intercompound analytical interferences in 1970 and 1971. Temporal trends in PCB residues were less obvious. Highest PCB residues were found in the industrialized areas of the Northwest and Midwest, and traces were present at most stations. Dieldrin and endrin residues remained essentially unchanged during this period; dieldrin residues were widespread and were highest in Hawaii and in areas of the Midwest where aldrin was used extensively. Toxaphene occurrence increased; it was formerly found only in fish from streams draining cotton-farming regions, but residues were detected in 1974 samples from other areas. According to the recommendation of the National Academy of Sciences' Water Quality Criteria, organochlorine residues in freshwater fish may have represented a hazard to piscivorous fish and wildlife at 71 percent of the stations sampled in 1970 and 66 percent in 1974.</span></p>","language":"English","publisher":"U.S. Environmental Protection Agency","usgsCitation":"Schmitt, C.J., Ludke, J.L., and Walsh, D.F., 1981, Organochlorine residues in fish: National Pesticide Monitoring Program, 1970-74: Pesticides Monitoring Journal, v. 14, no. 6, p. 136-206.","productDescription":"71 p.","startPage":"136","endPage":"206","costCenters":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"links":[{"id":348365,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","volume":"14","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a6145ffe4b06e28e9c25f76","contributors":{"authors":[{"text":"Schmitt, Christopher J. 0000-0001-6804-2360 cjschmitt@usgs.gov","orcid":"https://orcid.org/0000-0001-6804-2360","contributorId":491,"corporation":false,"usgs":true,"family":"Schmitt","given":"Christopher","email":"cjschmitt@usgs.gov","middleInitial":"J.","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":720886,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ludke, J. Larry","contributorId":63467,"corporation":false,"usgs":true,"family":"Ludke","given":"J.","email":"","middleInitial":"Larry","affiliations":[],"preferred":false,"id":720887,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Walsh, D. F.","contributorId":34860,"corporation":false,"usgs":true,"family":"Walsh","given":"D.","middleInitial":"F.","affiliations":[],"preferred":false,"id":720888,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70188668,"text":"70188668 - 1981 - The complex of alkaline rocks at Iron Hill, Powederhorn district, Gunnison County, Colorado","interactions":[],"lastModifiedDate":"2017-12-08T12:33:38","indexId":"70188668","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"The complex of alkaline rocks at Iron Hill, Powederhorn district, Gunnison County, Colorado","docAbstract":"<p>No abstract available</p>","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"New Mexico Geological Society Guidebook","language":"English","publisher":"New Mexico Geological Society","usgsCitation":"Armbrustmacher, T., 1981, The complex of alkaline rocks at Iron Hill, Powederhorn district, Gunnison County, Colorado, chap. <i>of</i> New Mexico Geological Society Guidebook, p. 293-296.","productDescription":"4 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,{"id":70197665,"text":"70197665 - 1981 - Geologic transect of the northern Diablo Range, California","interactions":[],"lastModifiedDate":"2018-06-15T14:35:21","indexId":"70197665","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Geologic transect of the northern Diablo Range, California","docAbstract":"<p>No abstract available.</p>","largerWorkTitle":"Upper Mesozoic Franciscan Rocks and Great Valley Sequence, Central Coast Ranges, California: Field Trip Guide V","conferenceTitle":"Annual Meeting Pacific Section, SPEM Field Trips 1 and 4","conferenceDate":"May 29, 1981","conferenceLocation":"California","language":"English","publisher":"Pacific Section, Society of Economic Paleontologists and Mineralogists","publisherLocation":"Tulsa, OK","usgsCitation":"Blake, M.C., 1981, Geologic transect of the northern Diablo Range, California, <i>in</i> Upper Mesozoic Franciscan Rocks and Great Valley Sequence, Central Coast Ranges, California: Field Trip Guide V, California, May 29, 1981.","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":355088,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Blake, M. Clark Jr.","contributorId":56675,"corporation":false,"usgs":true,"family":"Blake","given":"M.","suffix":"Jr.","email":"","middleInitial":"Clark","affiliations":[],"preferred":false,"id":738132,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188670,"text":"70188670 - 1981 - Potential source for crushed granite aggregate in Heard County, Georgia","interactions":[],"lastModifiedDate":"2017-06-20T17:53:40","indexId":"70188670","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":9,"text":"Other Report"},"seriesNumber":"Geologic Report Number 3","title":"Potential source for crushed granite aggregate in Heard County, Georgia","docAbstract":"<p>The production of crushed stone suitable for highway and general construction is a major industry in Georgia. The state ranks eighth in the nation in overall crushed stone production, and first in crushed granite production. Crushed stone production in Georgia in 1979 was 40,902,000 short tons worth $154,021,000 (D.H. White, Jr., US Bureau of Mines, personal commun., Aug. 1980). More than 3,000 people were employed by the crushed stone industry in Georgia during that year.</p><p>Presently, the only active quarry in Heard County is located in an amphibolite. Amphibolite is not a conventional aggregate. It has a high specific gravity, a tendency to make elongate fragments, and varies considerably in abrasion tests.</p><p>Because the nearest approved aggregate quarry is more than 25 miles from Franklin, the county seat, the purpose of this brief report is to describe a body of granite gneiss that may provide suitable aggregate for the crushed stone industry, potential quarry operators and various agencies in Heard County. This report is part of a project to study the geology and mineral resources of the Piedmont south of the Brevard Zone, and is not intended to supplant detailed site investigations by industry or consultants. The report is a joint effort between the Georgia Geologic Survey and the Office of Materials and Research of the Georgia Department of Transportation.</p>","language":"English","publisher":"Georgia Department of Natural Resources","publisherLocation":"Atlanta, GA","usgsCitation":"Atkins, R.L., Higgins, M.W., and Dickerson, R.P., 1981, Potential source for crushed granite aggregate in Heard County, Georgia, iv, 8 p.","productDescription":"iv, 8 p.","costCenters":[],"links":[{"id":342692,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":342691,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.americangeosciences.org/critical-issues/research-database/docs/potential-source-crushed-granite-aggregate-heard-county"}],"country":"United States","state":"Georgia","county":"Heard County","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-85.0151,33.4255],[-85.0139,33.4228],[-85.011,33.4146],[-85.0057,33.4015],[-85.004,33.3974],[-84.9998,33.3866],[-84.968,33.3007],[-84.9604,33.2822],[-84.9489,33.2824],[-84.9485,33.266],[-84.9545,33.2659],[-84.9486,33.25],[-84.9392,33.2247],[-85.0001,33.2027],[-85.0017,33.2023],[-85.005,33.2013],[-85.0088,33.1999],[-85.0121,33.1984],[-85.0213,33.1951],[-85.0262,33.1936],[-85.0414,33.1884],[-85.0414,33.1875],[-85.0424,33.1852],[-85.044,33.1828],[-85.0451,33.1819],[-85.0456,33.1815],[-85.0473,33.1814],[-85.0484,33.1814],[-85.0511,33.1818],[-85.0517,33.1823],[-85.0534,33.1831],[-85.0556,33.1836],[-85.0578,33.184],[-85.0589,33.1835],[-85.0594,33.183],[-85.0604,33.1816],[-85.061,33.1812],[-85.0615,33.1807],[-85.0631,33.1802],[-85.0642,33.1798],[-85.0647,33.1784],[-85.0658,33.1784],[-85.0729,33.176],[-85.0882,33.172],[-85.0877,33.1752],[-85.0878,33.1784],[-85.088,33.1866],[-85.0979,33.1869],[-85.0981,33.1951],[-85.108,33.1954],[-85.1081,33.1785],[-85.1174,33.1788],[-85.1175,33.1638],[-85.1295,33.1604],[-85.1426,33.1565],[-85.1942,33.1418],[-85.1991,33.1404],[-85.2307,33.1311],[-85.2373,33.1296],[-85.264,33.262],[-85.2946,33.428],[-85.2655,33.4276],[-85.2501,33.4279],[-85.2198,33.4276],[-85.1989,33.4271],[-85.1923,33.4272],[-85.1791,33.427],[-85.1224,33.4267],[-85.1197,33.4268],[-85.0977,33.4267],[-85.085,33.4265],[-85.0542,33.4261],[-85.0151,33.4255]]]},\"properties\":{\"name\":\"Heard\",\"state\":\"GA\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594a342be4b062508e36af6b","contributors":{"authors":[{"text":"Atkins, R. 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,{"id":70188663,"text":"70188663 - 1981 - Sedimentology of Great Sand Dunes, Colorado","interactions":[],"lastModifiedDate":"2017-06-20T16:28:57","indexId":"70188663","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3842,"text":"SEPM Special Publication","active":true,"publicationSubtype":{"id":10}},"seriesNumber":"31","title":"Sedimentology of Great Sand Dunes, Colorado","docAbstract":"<p>Eolian and adjacent deposits of Great Sand Dunes Colorado form a small but sedimentologically complex deposit Eolian sediments can be subdivided into three provinces trending downwind northeast I low as much as 10 m high alkali cemented dunes forming discontinuous rings around broad flat bottomed ephemeral lakes II undulating vegetated dunes as high as 10 m of barchan parabolic shrub coppice and transverse type with varying interdune types III high as much as 200 m transverse dunes with little or no vegetation and no true interdune deposits Eolian deposits are in contact with or intercalated with fluvial lacustrine and alluvial fan deposits and lap onto crystalline basement rocks of the Sangre de Cristo Range. </p><p>Analysis of a 40 year-span of aerial photographs and field observation of sand transport and cross bedding dip directions indicate that the main dune mass province III is accreting vertically and that dune types are growing in complexity in particular the star dunes This change from lateral migration to vertical growth most probably reflects Holocene changes in wind regime. </p><p>The Great Sand Dunes are an example of a localized cool climate intermontane eolian deposit characterized by extensive fluvial reworking With its rapid variation in thicknesses sedimentary structures and associated sedimentary deposits such a deposit would be difficult to interpret accurately in the ancient rock record However such a deposit could be of economic importance in petroleum and uranium exploration and in aquifer evaluation</p>","language":"English","publisher":"The Society of Economic Paleontologists and Mineralogists","usgsCitation":"Andrews, S., 1981, Sedimentology of Great Sand Dunes, Colorado: SEPM Special Publication, p. 279-291.","productDescription":"13 p.","startPage":"279","endPage":"291","costCenters":[],"links":[{"id":342682,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","otherGeospatial":"Great Sand Dunes","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -106.16363525390625,\n              38.3384247989913\n            ],\n            [\n              -106.07986450195312,\n              38.12159327165922\n            ],\n            [\n              -105.92742919921875,\n              37.779398571318765\n            ],\n            [\n              -105.80657958984375,\n              37.666429212090605\n            ],\n            [\n              -105.57861328125,\n              37.51735099503349\n            ],\n            [\n              -105.40420532226562,\n              37.56199695314352\n            ],\n            [\n              -105.22705078125,\n              37.6370724640931\n            ],\n            [\n              -105.39871215820312,\n              37.90194871393947\n            ],\n            [\n              -105.55938720703125,\n              38.17019379541814\n            ],\n            [\n              -105.75576782226562,\n              38.36211833953394\n            ],\n            [\n              -106.00021362304688,\n              38.48154475346391\n            ],\n            [\n              -106.16363525390625,\n              38.3384247989913\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594a342de4b062508e36af74","contributors":{"authors":[{"text":"Andrews, Sarah","contributorId":104059,"corporation":false,"usgs":true,"family":"Andrews","given":"Sarah","email":"","affiliations":[],"preferred":false,"id":698844,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188738,"text":"70188738 - 1981 - Road log","interactions":[],"lastModifiedDate":"2017-06-22T14:46:24","indexId":"70188738","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Road log","docAbstract":"<p>No abstract available</p>","largerWorkType":{"id":24,"text":"Conference Paper"},"largerWorkTitle":"Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists","largerWorkSubtype":{"id":19,"text":"Conference Paper"},"language":"English","publisher":"Field Conference of Pennsylvania Geologists","usgsCitation":"1981, Road log, <i>in</i> Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists, p. 103-163.","productDescription":"31 p.","startPage":"103","endPage":"163","costCenters":[],"links":[{"id":342778,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":342777,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://fcopg.org/history/guidebooks"}],"country":"United States","state":"Pennsylvania","county":"Bradford County, Tioga County","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-76.9291,42.0024],[-76.9095,42.0025],[-76.8966,42.0026],[-76.6476,42.0019],[-76.6334,42.0017],[-76.5964,42.0013],[-76.5618,42.0009],[-76.5531,42.0008],[-76.5229,42.0005],[-76.466,41.9999],[-76.3826,41.9989],[-76.1467,41.9991],[-76.1382,41.898],[-76.1336,41.8467],[-76.1285,41.7935],[-76.1258,41.773],[-76.1219,41.7217],[-76.1171,41.6531],[-76.1959,41.648],[-76.1996,41.6467],[-76.2015,41.6435],[-76.2015,41.6426],[-76.2015,41.6408],[-76.2016,41.6353],[-76.2016,41.6344],[-76.2023,41.6335],[-76.2029,41.6322],[-76.2063,41.6145],[-76.209,41.6004],[-76.2091,41.5982],[-76.2184,41.5579],[-76.2217,41.5447],[-76.2383,41.5458],[-76.2432,41.5463],[-76.2487,41.5468],[-76.3277,41.5526],[-76.4454,41.5608],[-76.5,41.5649],[-76.5975,41.5715],[-76.6367,41.5745],[-76.6478,41.5755],[-76.6619,41.5765],[-76.679,41.578],[-76.6938,41.579],[-76.6993,41.5795],[-76.7496,41.5834],[-76.7569,41.5839],[-76.787,41.5872],[-76.7949,41.5882],[-76.8005,41.5887],[-76.8103,41.5896],[-76.8133,41.5901],[-76.8219,41.5911],[-76.8379,41.593],[-76.8747,41.5968],[-76.8772,41.5941],[-76.8932,41.586],[-76.9,41.5842],[-76.9073,41.5824],[-76.9129,41.5815],[-76.9135,41.5815],[-76.9147,41.582],[-76.9159,41.5825],[-76.9172,41.5825],[-76.9202,41.5811],[-76.9233,41.577],[-76.9258,41.5721],[-76.9308,41.5698],[-76.9375,41.5685],[-76.9455,41.5667],[-76.9517,41.5644],[-76.9572,41.5608],[-76.961,41.5559],[-76.9634,41.5522],[-76.999,41.551],[-77.0009,41.5506],[-77.0751,41.5481],[-77.1279,41.5469],[-77.1979,41.5457],[-77.25,41.5449],[-77.2807,41.5445],[-77.2954,41.5441],[-77.315,41.5442],[-77.3335,41.5442],[-77.3512,41.5442],[-77.3905,41.5438],[-77.4034,41.5438],[-77.4801,41.5434],[-77.4813,41.5434],[-77.4868,41.5434],[-77.4997,41.5434],[-77.5193,41.5434],[-77.5978,41.5424],[-77.5991,41.5424],[-77.5997,41.5497],[-77.601,41.5987],[-77.601,41.6128],[-77.6017,41.6437],[-77.6017,41.6518],[-77.603,41.6999],[-77.603,41.7186],[-77.6043,41.7472],[-77.6043,41.7499],[-77.6043,41.7558],[-77.605,41.7944],[-77.605,41.8007],[-77.6056,41.8093],[-77.6056,41.8121],[-77.6057,41.8334],[-77.6063,41.8402],[-77.6076,41.9015],[-77.6076,41.9174],[-77.6077,41.9211],[-77.6096,41.9998],[-77.4394,42.001],[-77.1767,42.0002],[-77.1133,42.001],[-76.9651,42.0023],[-76.9291,42.0024]]]},\"properties\":{\"name\":\"Bradford\",\"state\":\"PA\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594cd744e4b062508e395205","contributors":{"editors":[{"text":"Berg, T.M.","contributorId":193266,"corporation":false,"usgs":false,"family":"Berg","given":"T.M.","email":"","affiliations":[],"preferred":false,"id":699528,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Crowl, G.H.","contributorId":60719,"corporation":false,"usgs":true,"family":"Crowl","given":"G.H.","email":"","affiliations":[],"preferred":false,"id":699529,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Edmunds, W.E.","contributorId":45475,"corporation":false,"usgs":true,"family":"Edmunds","given":"W.E.","email":"","affiliations":[],"preferred":false,"id":699530,"contributorType":{"id":2,"text":"Editors"},"rank":3},{"text":"Luce, P.B.","contributorId":193265,"corporation":false,"usgs":false,"family":"Luce","given":"P.B.","email":"","affiliations":[],"preferred":false,"id":699531,"contributorType":{"id":2,"text":"Editors"},"rank":4},{"text":"Sevon, W. D.","contributorId":38650,"corporation":false,"usgs":true,"family":"Sevon","given":"W. D.","affiliations":[],"preferred":false,"id":699532,"contributorType":{"id":2,"text":"Editors"},"rank":5},{"text":"Wilshusen, P.","contributorId":70616,"corporation":false,"usgs":true,"family":"Wilshusen","given":"P.","email":"","affiliations":[],"preferred":false,"id":699533,"contributorType":{"id":2,"text":"Editors"},"rank":6},{"text":"Woodrow, Donald L. 0000-0003-3874-7508","orcid":"https://orcid.org/0000-0003-3874-7508","contributorId":193175,"corporation":false,"usgs":false,"family":"Woodrow","given":"Donald","email":"","middleInitial":"L.","affiliations":[{"id":39857,"text":"former USGS contractor","active":true,"usgs":false}],"preferred":false,"id":699534,"contributorType":{"id":2,"text":"Editors"},"rank":7},{"text":"Pohn, H. A.","contributorId":6912,"corporation":false,"usgs":true,"family":"Pohn","given":"H. 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,{"id":70188737,"text":"70188737 - 1981 - Economic geology of Tioga and Bradford Counties","interactions":[],"lastModifiedDate":"2017-06-22T14:39:56","indexId":"70188737","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Economic geology of Tioga and Bradford Counties","docAbstract":"<p>No abstract available</p>","largerWorkTitle":"Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists","conferenceTitle":"Forty-sixth annual field conference of Pennsylvania geologists, 1981.","conferenceDate":"October 2-3, 1981","conferenceLocation":"Wellsboro, PA","language":"English","usgsCitation":"Luce, P., and Edmunds, W., 1981, Economic geology of Tioga and Bradford Counties, <i>in</i> Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists, Wellsboro, PA, October 2-3, 1981, p. 57-74.","productDescription":"18 p.","startPage":"57","endPage":"74","costCenters":[],"links":[{"id":342772,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":342771,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://fcopg.org/history/guidebooks"}],"country":"United States","state":"Pennsylvania","county":"Bradford County, Tioga County","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-76.9291,42.0024],[-76.9095,42.0025],[-76.8966,42.0026],[-76.6476,42.0019],[-76.6334,42.0017],[-76.5964,42.0013],[-76.5618,42.0009],[-76.5531,42.0008],[-76.5229,42.0005],[-76.466,41.9999],[-76.3826,41.9989],[-76.1467,41.9991],[-76.1382,41.898],[-76.1336,41.8467],[-76.1285,41.7935],[-76.1258,41.773],[-76.1219,41.7217],[-76.1171,41.6531],[-76.1959,41.648],[-76.1996,41.6467],[-76.2015,41.6435],[-76.2015,41.6426],[-76.2015,41.6408],[-76.2016,41.6353],[-76.2016,41.6344],[-76.2023,41.6335],[-76.2029,41.6322],[-76.2063,41.6145],[-76.209,41.6004],[-76.2091,41.5982],[-76.2184,41.5579],[-76.2217,41.5447],[-76.2383,41.5458],[-76.2432,41.5463],[-76.2487,41.5468],[-76.3277,41.5526],[-76.4454,41.5608],[-76.5,41.5649],[-76.5975,41.5715],[-76.6367,41.5745],[-76.6478,41.5755],[-76.6619,41.5765],[-76.679,41.578],[-76.6938,41.579],[-76.6993,41.5795],[-76.7496,41.5834],[-76.7569,41.5839],[-76.787,41.5872],[-76.7949,41.5882],[-76.8005,41.5887],[-76.8103,41.5896],[-76.8133,41.5901],[-76.8219,41.5911],[-76.8379,41.593],[-76.8747,41.5968],[-76.8772,41.5941],[-76.8932,41.586],[-76.9,41.5842],[-76.9073,41.5824],[-76.9129,41.5815],[-76.9135,41.5815],[-76.9147,41.582],[-76.9159,41.5825],[-76.9172,41.5825],[-76.9202,41.5811],[-76.9233,41.577],[-76.9258,41.5721],[-76.9308,41.5698],[-76.9375,41.5685],[-76.9455,41.5667],[-76.9517,41.5644],[-76.9572,41.5608],[-76.961,41.5559],[-76.9634,41.5522],[-76.999,41.551],[-77.0009,41.5506],[-77.0751,41.5481],[-77.1279,41.5469],[-77.1979,41.5457],[-77.25,41.5449],[-77.2807,41.5445],[-77.2954,41.5441],[-77.315,41.5442],[-77.3335,41.5442],[-77.3512,41.5442],[-77.3905,41.5438],[-77.4034,41.5438],[-77.4801,41.5434],[-77.4813,41.5434],[-77.4868,41.5434],[-77.4997,41.5434],[-77.5193,41.5434],[-77.5978,41.5424],[-77.5991,41.5424],[-77.5997,41.5497],[-77.601,41.5987],[-77.601,41.6128],[-77.6017,41.6437],[-77.6017,41.6518],[-77.603,41.6999],[-77.603,41.7186],[-77.6043,41.7472],[-77.6043,41.7499],[-77.6043,41.7558],[-77.605,41.7944],[-77.605,41.8007],[-77.6056,41.8093],[-77.6056,41.8121],[-77.6057,41.8334],[-77.6063,41.8402],[-77.6076,41.9015],[-77.6076,41.9174],[-77.6077,41.9211],[-77.6096,41.9998],[-77.4394,42.001],[-77.1767,42.0002],[-77.1133,42.001],[-76.9651,42.0023],[-76.9291,42.0024]]]},\"properties\":{\"name\":\"Bradford\",\"state\":\"PA\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594cd745e4b062508e395207","contributors":{"authors":[{"text":"Luce, P.B.","contributorId":193265,"corporation":false,"usgs":false,"family":"Luce","given":"P.B.","email":"","affiliations":[],"preferred":false,"id":699526,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Edmunds, W.E.","contributorId":45475,"corporation":false,"usgs":true,"family":"Edmunds","given":"W.E.","email":"","affiliations":[],"preferred":false,"id":699527,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70188665,"text":"70188665 - 1981 - Subdivision and regional stratigraphy of the pre-Punta Gorda rocks (lowermost cretaceous-jurassic?) in South Florida","interactions":[],"lastModifiedDate":"2017-06-20T16:52:14","indexId":"70188665","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1871,"text":"Gulf Coast Association of Geological Societies Transactions","active":true,"publicationSubtype":{"id":10}},"title":"Subdivision and regional stratigraphy of the pre-Punta Gorda rocks (lowermost cretaceous-jurassic?) in South Florida","docAbstract":"<p>In recent years several wells have been drilled in the South Florida Basin through carbonate and evaporite sequences to depths as much as 5,300 ft below the Punta Gorda Anhydrite. The deepest well penetrated igneous basement rocks to a total depth of 18, 670 ft. Correlation of anhydrite beds below the Punta Gorda has revealed several thick anhydrite units (200 to 400 ft) with regional persistence. </p><p>The pre-Punta Gorda section is subdivided into four easily identifiable units listed in order of increasing age — Lehigh Acres (lowermost Comanchean), Pumpkin Bay (upper Coahuilan), Bone Island (lower Coahuilan), and Wood River (Jurassic?) Formations, all newly named in this report. In addition, the Lehigh Acres is divided into the West Felda Shale (base), Twelve Mile, and Able Members which are also named and defined in this report. Geochemical evidence indicates that the Lehigh Acres unit and the upper part of the Pumpkin Bay unit contain the most likely source beds for petroleum. </p><p>Only two production tests have been carried out in the basin in strata below the oil-productive Sunniland Limestone. One was through casing in a Wood River dolomite zone. It reportedly produced water and some gas. The other was a drill stem test in an upper Pumpkin Bay dolomite zone which produced only water. In the Gulf Florida State Lease 826Y (Permit No. 275), a moderately porous, 350-ft-thick Pumpkin Bay dolomite zone was observed. As this well is west of the axis of the basin, better reservoir conditions presumably exist on the West Florida shelf than onshore. </p>","language":"English","publisher":"Gulf Coast Association of Geological Societies","usgsCitation":"Applegate, A., Winston, G.O., and Palacas, J.G., 1981, Subdivision and regional stratigraphy of the pre-Punta Gorda rocks (lowermost cretaceous-jurassic?) in South Florida: Gulf Coast Association of Geological Societies Transactions, v. 31, no. Supplement, p. 447-453.","productDescription":"7 p.","startPage":"447","endPage":"453","costCenters":[],"links":[{"id":342685,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Florida","otherGeospatial":"South Florida 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,{"id":70188946,"text":"70188946 - 1981 - On the use of nonlinear soil models","interactions":[],"lastModifiedDate":"2017-06-27T16:47:56","indexId":"70188946","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"On the use of nonlinear soil models","docAbstract":"<p>The basic definitions of, and the differences between, currently available soil models are reviewed. These models are applied to site response analyses where two depths and two levels of base input motion are considered. Computational results are presented and compared with regard to the effects of using different soil models on computed site response. Other implications resulting from the choice of soil model for seismic response analysis are also discussed.&nbsp;</p>","largerWorkType":{"id":24,"text":"Conference Paper"},"largerWorkTitle":"Proceedings: First International Conference on Recent Advances in Geochemical Earthquake Engineering and Soil Dynamics","largerWorkSubtype":{"id":19,"text":"Conference Paper"},"conferenceTitle":"1981 - First International Conference on Recent Advances in Geotechnical Earthquake Engineering & Soil Dynamics","conferenceDate":"April 26-May 3, 1981","conferenceLocation":"St. Louis, MO","language":"English","publisher":"International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics","usgsCitation":"Chen, A.T., 1981, On the use of nonlinear soil models, <i>in</i> Proceedings: First International Conference on Recent Advances in Geochemical Earthquake Engineering and Soil Dynamics, St. Louis, MO, April 26-May 3, 1981, p. 435-440.","productDescription":"6 p.","startPage":"435","endPage":"440","costCenters":[],"links":[{"id":343046,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59536ee2e4b062508e3c7b2b","contributors":{"authors":[{"text":"Chen, Albert T.F.","contributorId":80671,"corporation":false,"usgs":true,"family":"Chen","given":"Albert","email":"","middleInitial":"T.F.","affiliations":[],"preferred":false,"id":701472,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188955,"text":"70188955 - 1981 - Conceptual models governing leaching behavior and their long-term predictive capability","interactions":[],"lastModifiedDate":"2017-06-27T18:21:14","indexId":"70188955","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5440,"text":"Nuclear and Chemical Waste Management","active":true,"publicationSubtype":{"id":10}},"title":"Conceptual models governing leaching behavior and their long-term predictive capability","docAbstract":"<p><span>Six models that may be used to describe the interaction of radioactive waste solids with aqueous solutions are as follows:</span></p><p><ol><li>Simple linear mass transfer;<br></li><li>Simple parabolic mass transfer;<br></li><li>Parabolic mass transfer with the formation of a diffusion-limiting surface layer at an arbitrary time;<br></li><li>Initial parabolic mass transfer followed by linear mass transfer at an arbitrary time;<br></li><li>Parabolic (or linear) mass transfer and concomitant surface sorption; and<br></li><li>Parabolic (or linear) mass transfer and concomitant chemical precipitation.<br></li></ol></p><p><span>Some of these models lead to either illogical or unrealistic predictions when published data are extrapolated to long times. These predictions result because most data result from short-term experimentation. Probably for longer times, processes will occur that have not been observed in the shorter experiments. This hypothesis has been verified by mass-transfer data from laboratory experiments using natural volcanic glass to predict the composition of groundwater. That such rate-limiting mechanisms do occur is reassuring, although now it is not possible to deduce a single mass-transfer limiting mechanism that could control the solution concentration of all components of all waste forms being investigated. Probably the most reasonable mechanisms are surface sorption and chemical precipitation of the species of interest. Another is limiting of mass transfer by chemical precipitation on the waste form surface of a substance not containing the species of interest, that is, presence of a diffusion-limiting layer. The presence of sorption and chemical precipitation as factors limiting mass transfer has been verified in natural groundwater systems, whereas the diffusion-limiting mechanism has not been verified yet.</span></p>","language":"English","publisher":"Elsevier","doi":"10.1016/0191-815X(81)90056-5","usgsCitation":"Claassen, H.C., 1981, Conceptual models governing leaching behavior and their long-term predictive capability: Nuclear and Chemical Waste Management, v. 2, no. 4, p. 307-313, https://doi.org/10.1016/0191-815X(81)90056-5.","productDescription":"7 p.","startPage":"307","endPage":"313","costCenters":[],"links":[{"id":343054,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"2","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59536ee1e4b062508e3c7b29","contributors":{"authors":[{"text":"Claassen, Hans C.","contributorId":25165,"corporation":false,"usgs":true,"family":"Claassen","given":"Hans","email":"","middleInitial":"C.","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":701605,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188956,"text":"70188956 - 1981 - Linear island and seamount chains, aseismic ridges and intraplate volcanism: Results from DSDP","interactions":[],"lastModifiedDate":"2017-06-27T18:25:34","indexId":"70188956","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3842,"text":"SEPM Special Publication","active":true,"publicationSubtype":{"id":10}},"title":"Linear island and seamount chains, aseismic ridges and intraplate volcanism: Results from DSDP","docAbstract":"<p id=\"p-5\">The Deep Sea Drilling Project drilled a substantial number of sites that bear on the origin of linear island and seamount chains, aseismic ridges and other more regional expressions of intraplate volcanism. Drilling in the Emperor Seamounts during Leg 55 was particularly successful. Results from this leg include: 1) the volcanoes of the Hawaiian-Emperor chain continue to increase in age away from Kilauea as predicted. 2) Suiko Seamount formed at a paleolatitide of 26.9±3.5°N, 7° north of present-day Hawaii, but far south of its present latitude of 44.8°N. 3) the volcanic rock types recovered include hawaiite, mugearite, alkalic basalt and tholeiitic basalt in the sequence and relative volume expected for Hawaiian volcanoes. 4) the tholeiitic and alkalic basalts recovered are geochemically similar to those in the Hawaiian Islands, only the ratio of<span>&nbsp;</span><sup>87</sup>Sr/<sup>86</sup>Sr appears to change through time. All the lavas appear to be derived from a source that has small-scale heterogeneities, but is homogeneous on a large scale. 4) The Emperor Seamounts were once volcanic islands that underwent subaerial and shallow marine erosion, and deposition of shallow-water biogenic carbonate sediments that capped all or most of each volcano.</p><p id=\"p-6\">Drilling in other regions has yielded less conclusive results. For example, it is uncertain if the Line Islands are an age progressive chain (hot-spot trace) or result from some other type of intraplate volcanism. The mid-Pacific Mountains also show evidence of originating from a regional episode of volcanism in the mid-Cretaceous. Drilling in the Nauru Basin encountered a voluminous mid-Cretaceous volcanic flow-sill complex that overlies Jurassic magnetic anomalies, yet is composed of depleted tholeiite. In the Indian Ocean, drilling on the Ninety-East Ridge established that it 1) is volcanic in origin; 2) is older to the north; 3) formed in shallow water, and 4) formed further south and has moved northward. It appears that the Ninety-East Ridge, like the Hawaiian-Emperor chain, is a hot spot trace. In the Atlantic Ocean, drilling on the Iceland-Faeroe Ridge and the Rio Grande Rise-Walvis Ridge suggests that all these aseismic ridges are hot spot traces generated by the Iceland and Tristan de Cunha hot-spots.</p>","language":"English","publisher":"SEPM Society for Sedimentary Geology","doi":"10.2110/pec.81.32.0007","usgsCitation":"Clague, D.A., 1981, Linear island and seamount chains, aseismic ridges and intraplate volcanism: Results from DSDP: SEPM Special Publication, v. 32, p. 7-22, https://doi.org/10.2110/pec.81.32.0007.","productDescription":"16 p.","startPage":"7","endPage":"22","costCenters":[],"links":[{"id":343055,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59536ee1e4b062508e3c7b27","contributors":{"authors":[{"text":"Clague, David A.","contributorId":77105,"corporation":false,"usgs":false,"family":"Clague","given":"David","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":701606,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188941,"text":"70188941 - 1981 - Radiometric and paleomagnetic evidence for the Emperor reversed polarity event at 0.46 ± 0.05 M.Y. in basalt lava flows from the eastern Snake River Plain, Idaho","interactions":[],"lastModifiedDate":"2017-06-27T16:26:00","indexId":"70188941","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Radiometric and paleomagnetic evidence for the Emperor reversed polarity event at 0.46 ± 0.05 M.Y. in basalt lava flows from the eastern Snake River Plain, Idaho","docAbstract":"<p><span>K-Ar and paleomagnetic data from cores through a sequence of basalt flows in the eastern Snake River Plain provide evidence for a brief (0.005 to 0.01 m.y.) reversal of the geomagnetic field 0.46 ± 0.05 m.y. ago. This reversed polarity event has also been found in sea-floor magnetic anomalies and in sediment cores and is probably the Emperor event of Ryan [1972].</span></p>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/GL008i010p01055","usgsCitation":"Champion, D.E., Dalrymple, G.B., and Kuntz, M., 1981, Radiometric and paleomagnetic evidence for the Emperor reversed polarity event at 0.46 ± 0.05 M.Y. in basalt lava flows from the eastern Snake River Plain, Idaho: Geophysical Research Letters, v. 8, no. 10, p. 1055-1058, https://doi.org/10.1029/GL008i010p01055.","productDescription":"4 p.","startPage":"1055","endPage":"1058","costCenters":[],"links":[{"id":343042,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Idaho, Oregon","otherGeospatial":"Snake River Plain","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n     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Brent","contributorId":54564,"corporation":false,"usgs":true,"family":"Dalrymple","given":"G.","email":"","middleInitial":"Brent","affiliations":[],"preferred":false,"id":701423,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kuntz, Mel A. 0000-0001-8828-5474","orcid":"https://orcid.org/0000-0001-8828-5474","contributorId":6446,"corporation":false,"usgs":true,"family":"Kuntz","given":"Mel A.","affiliations":[],"preferred":false,"id":701424,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70188978,"text":"70188978 - 1981 - Progradational sequences in Miocene shoreline deposits, southeastern Caliente Range, California","interactions":[],"lastModifiedDate":"2024-05-22T11:05:06.590031","indexId":"70188978","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2450,"text":"Journal of Sedimentary Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Progradational sequences in Miocene shoreline deposits, southeastern Caliente Range, California","docAbstract":"<p>An exceptionally well exposed marine-nonmarine transition in middle Miocene strata exists in the southeastern Caliente Range, California. About 50 individual progradational sequences form a succession that ranges in thickness from approximately 1000 m (where predominantly nonmarine) to more than 2500 m (where predominantly marine). Paleogreographic evidence in basalt flows near the top of the succession and in overlying fluvial deposists indicates that these middle Miocene strata were deposited across a north-northwest trending shoreline.</p><p>A complete progradational sequence typically is several meters to a few tens of meters thick and includes strata that represent three intertonguing stratigraphic units. Individual sequences generally rest on a thin gravel deposit interpreted as a transgressive lag on an erosional surface. The gravel is overlain by structureless siltstone or fine-grained sandstone deposited at water depths where the rate of faunal mixing exceeded that of production of structures by physical processes. These rocks grade upward into bedded fine sandstone deposited closer to shore where physical processes exceeded bioturbation. Crossbedded lenses of coarse sand or fine gravel in the upper part of this facies suggest the presence of failry long-period surface waves. The bedded fine sandstone is sharply overlain by a crossbedded coarse sandstone facies that is interpreted as a combined offshore bar-rip channel-surf zone assemblage. Cross-strata dip dominantly offshore, suggesting substantial deposition from rip currents. A secondary, shore=parallel mode of cross-strata direction suggests longshore currents produced by surface waves from the northwest. The crossbedded coarse-grained sandstone grades upward into planar-bedded medium-grained sandstone that is interpreted as a beach foreshore. This facies grades upward through structureless medium-grained sandstone into nonmarine or lagoonal red and green mudstone of the Caliente Formation.</p><p>The middle Miocene succession was deposited in a subsiding basin that was otherwise remarkably stable tectonically; the position of the strand line differed no more than a few kilometers through a period of 1 to 3 m.y. The average duration of the transgressive-regressive cycles, a few tens of thousands of years, together with their distribution in groups of three or four in the lower two-thirds of the succession, is consistent with the pattern of long-term climatic cycles produced by periodicity of the earth's solar orbit and may be related to eustatic sea level changes attendant to the development of the Antarctic ice cap. Changes in the pattern of progradation in the upper part of the succession and nearby basaltic eruptions may hav been precursors to the onset of movement along the San Andreas fault in this area 12-14 m.y. ago.</p>","language":"English","publisher":"Society of Economic Paleontologists and Mineralogists","doi":"10.1306/212F7C39-2B24-11D7-8648000102C1865D","usgsCitation":"Clifton, H.E., 1981, Progradational sequences in Miocene shoreline deposits, southeastern Caliente Range, California: Journal of Sedimentary Petrology, v. 51, no. 1, p. 165-184, https://doi.org/10.1306/212F7C39-2B24-11D7-8648000102C1865D.","productDescription":"20 p.","startPage":"165","endPage":"184","costCenters":[],"links":[{"id":343064,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"Caliente Range","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -120.34973144531249,\n              34.864524651614815\n            ],\n            [\n              -119.66033935546875,\n              34.864524651614815\n            ],\n            [\n              -119.66033935546875,\n              35.35545618392078\n            ],\n            [\n              -120.34973144531249,\n              35.35545618392078\n            ],\n            [\n              -120.34973144531249,\n              34.864524651614815\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"51","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59660f16e4b0d1f9f05cef32","contributors":{"authors":[{"text":"Clifton, H. Edward","contributorId":46503,"corporation":false,"usgs":true,"family":"Clifton","given":"H.","email":"","middleInitial":"Edward","affiliations":[],"preferred":false,"id":702164,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011769,"text":"70011769 - 1981 - An iridium abundance anomaly at the palynological Cretaceous-Tertiary boundary in northern New Mexico","interactions":[],"lastModifiedDate":"2025-12-22T17:07:03.547307","indexId":"70011769","displayToPublicDate":"1981-12-18T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3338,"text":"Science","active":true,"publicationSubtype":{"id":10}},"title":"An iridium abundance anomaly at the palynological Cretaceous-Tertiary boundary in northern New Mexico","docAbstract":"<p>An iridium abundance anomaly, with concentrations up to 5000 parts per trillion over a background level of 4 to 20 parts per trillion, has been located in sedimentary rocks laid down under freshwater swamp conditions in the Raton Basin of northeastern New Mexico. The anomaly occurs at the base of a coal bed, at the same stratigraphic position at which several well-known species of Cretaceous-age pollen became extinct.&nbsp;</p>","language":"English","publisher":"American Association for the Advancement of Science","doi":"10.1126/science.214.4527.1341","issn":"00368075","usgsCitation":"Orth, C.J., Gilmore, J.S., Knight, J., Pillmore, C.L., Tschudy, R., and Fassett, J., 1981, An iridium abundance anomaly at the palynological Cretaceous-Tertiary boundary in northern New Mexico: Science, v. 214, no. 4527, p. 1341-1343, https://doi.org/10.1126/science.214.4527.1341.","productDescription":"3 p.","startPage":"1341","endPage":"1343","costCenters":[],"links":[{"id":221471,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New Mexico","otherGeospatial":"northern New Mexico","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -109.03751829060221,\n              36.98949799286949\n            ],\n            [\n              -109.03751829060221,\n              35.078782124856104\n            ],\n            [\n              -103.04195147308809,\n              35.078782124856104\n            ],\n            [\n              -103.04195147308809,\n              36.98949799286949\n            ],\n            [\n              -109.03751829060221,\n              36.98949799286949\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      }\n    }\n  ]\n}","volume":"214","issue":"4527","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ea92e4b0c8380cd48958","contributors":{"authors":[{"text":"Orth, C. J.","contributorId":90034,"corporation":false,"usgs":true,"family":"Orth","given":"C.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":361923,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gilmore, J. S.","contributorId":72927,"corporation":false,"usgs":true,"family":"Gilmore","given":"J.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":361922,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Knight, J.D.","contributorId":46688,"corporation":false,"usgs":true,"family":"Knight","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":361919,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Pillmore, C. L.","contributorId":46093,"corporation":false,"usgs":true,"family":"Pillmore","given":"C.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":361918,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Tschudy, R.H.","contributorId":55023,"corporation":false,"usgs":true,"family":"Tschudy","given":"R.H.","email":"","affiliations":[],"preferred":false,"id":361920,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Fassett, J.E.","contributorId":68758,"corporation":false,"usgs":true,"family":"Fassett","given":"J.E.","email":"","affiliations":[],"preferred":false,"id":361921,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70207173,"text":"70207173 - 1981 - Geodetic measurement of crustal deformation on the San Andreas, Hayward, and Calaveras faults near San Francisco, California","interactions":[],"lastModifiedDate":"2020-06-01T12:34:06.568108","indexId":"70207173","displayToPublicDate":"1981-12-11T11:46:55","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Geodetic measurement of crustal deformation on the San Andreas, Hayward, and Calaveras faults near San Francisco, California","docAbstract":"<p><span>Analysis of a geodetic network of 115 lines crossing the San Andreas, Hayward, and Calaveras faults in the vicinity of San Francisco Bay and measured repeatedly between 1970 and 1980 has revealed details about the accommodation of relative plate motion in this area. The most striking result is that the deformation is not uniformly distributed across the area. In the east bay, along the Hayward and Calaveras faults, all motion appears to take place as slip directly on the fault, with no accumulation of strain in the adjacent crust. On both the Calaveras and the Hayward faults the rate obtained for the 1970 to 1980 period agrees with geologic rates spanning a few million years and with creep rates spanning a few decades. The Hayward fault slip rate is 7 ± 1 mm/yr. The Calaveras fault slip rate is 7 ± 1 mm/yr, with perhaps half of this slip distributed across a zone a few kilometers wide, probably as inelastic deformation of weak near‐surface material. The absence of strain accumulation in the east bay is surprising since the Hayward and Calaveras faults have been the site of large earthquakes in the past. A block located east of the Calaveras fault and south of the Las Positas fault has been rotating clockwise at a rate of 0.3 ± 0.1 μrad/yr with very little internal deformation. Along the San Francisco peninsula no detectable slip occurs (less than 1.5 mm/yr) at the surface, but appreciable strain is accumulating. Near fault shear strain rates are 0.6 ± 0.1 μstrain/yr (engineering) with direction N47°W ± 9. The slip rate near the San Andreas fault is 12.2 ± 3.9 mm/yr distributed across a broad zone. The relative motion across the whole region during the period 1970–1980 is 32.1 ± 7.4 mm/yr.</span></p>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JB086iB11p10853","usgsCitation":"Prescott, W., Lisowski, M., and Savage, J.C., 1981, Geodetic measurement of crustal deformation on the San Andreas, Hayward, and Calaveras faults near San Francisco, California: Journal of Geophysical Research B: Solid Earth, v. 86, no. B11, p. 10853-10869, https://doi.org/10.1029/JB086iB11p10853.","productDescription":"17 p.","startPage":"10853","endPage":"10869","costCenters":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true},{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":370155,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Francisco Bay Area","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -122.947998046875,\n              36.78289206199065\n            ],\n            [\n              -121.09130859375,\n              36.78289206199065\n            ],\n            [\n              -121.09130859375,\n              38.21660403859855\n            ],\n            [\n              -122.947998046875,\n              38.21660403859855\n            ],\n            [\n              -122.947998046875,\n              36.78289206199065\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"86","issue":"B11","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","contributors":{"authors":[{"text":"Prescott, W.H.","contributorId":96337,"corporation":false,"usgs":true,"family":"Prescott","given":"W.H.","email":"","affiliations":[],"preferred":false,"id":777149,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lisowski, Michael 0000-0003-4818-2504 mlisowski@usgs.gov","orcid":"https://orcid.org/0000-0003-4818-2504","contributorId":637,"corporation":false,"usgs":true,"family":"Lisowski","given":"Michael","email":"mlisowski@usgs.gov","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true},{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"preferred":true,"id":777150,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Savage, James C. 0000-0002-5114-7673 jasavage@usgs.gov","orcid":"https://orcid.org/0000-0002-5114-7673","contributorId":2412,"corporation":false,"usgs":true,"family":"Savage","given":"James","email":"jasavage@usgs.gov","middleInitial":"C.","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"preferred":true,"id":777151,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":25145,"text":"25145 - 1981 - Characteristics of mineral deposit occurrences: guide book for use as an aid in mineral resource studies","interactions":[],"lastModifiedDate":"2014-07-14T13:29:00","indexId":"25145","displayToPublicDate":"1981-12-01T13:28:25","publicationYear":"1981","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":6,"text":"USGS Unnumbered Series"},"title":"Characteristics of mineral deposit occurrences: guide book for use as an aid in mineral resource studies","docAbstract":"No abstract available.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Denver, CO","doi":"10.3133/25145","usgsCitation":"Erickson, R.L., 1981, Characteristics of mineral deposit occurrences: guide book for use as an aid in mineral resource studies, ii, 227 p., https://doi.org/10.3133/25145.","productDescription":"ii, 227 p.","numberOfPages":"229","costCenters":[],"links":[{"id":289926,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53c4fbf8e4b0b58d96eeb561","contributors":{"authors":[{"text":"Erickson, Ralph Leroy","contributorId":107263,"corporation":false,"usgs":true,"family":"Erickson","given":"Ralph","email":"","middleInitial":"Leroy","affiliations":[],"preferred":false,"id":193291,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
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