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,{"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":70188933,"text":"70188933 - 1981 - Earth flows along Henry Creek, northern Alaska","interactions":[],"lastModifiedDate":"2017-06-27T15:48:47","indexId":"70188933","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":894,"text":"Arctic","active":true,"publicationSubtype":{"id":10}},"title":"Earth flows along Henry Creek, northern Alaska","docAbstract":"<p>Many earth flows occurred during the summer of 1979 in the hilly terrain near Umiat, Alaska, particularly along Henry Creek. Most were shallow, involving only the tundra mat and no more than 1.5 m of the underlying mud. The summer of 1979 was the warmest and wettest for the period of record at Umiat, and precipitation was characterized by brief but intense localized rainstorms. Failure probably was triggered by the heavy rains and facilitated by an absorbent tundra mat over a clayey substrate, and perhaps in some cases by a thicker than normal active layer. Flows of this kind have occurred repeatedly in the Umiat area, most likely during summers in which climatic conditions were similar to those of 1979.</p>","language":"English","publisher":"Arctic Institute of North America","doi":"10.14430/arctic2537","usgsCitation":"Carter, L.D., and Galloway, J., 1981, Earth flows along Henry Creek, northern Alaska: Arctic, v. 34, no. 4, p. 325-328, https://doi.org/10.14430/arctic2537.","productDescription":"4 p.","startPage":"325","endPage":"328","costCenters":[],"links":[{"id":480566,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.14430/arctic2537","text":"Publisher Index Page"},{"id":343034,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Colville River, Ikpikpuk River","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -155.9619140625,\n              68.94655388492086\n            ],\n            [\n              -149.732666015625,\n              68.94655388492086\n            ],\n            [\n              -149.732666015625,\n              71.28317384014204\n            ],\n            [\n              -155.9619140625,\n              71.28317384014204\n            ],\n            [\n              -155.9619140625,\n              68.94655388492086\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"34","issue":"4","noUsgsAuthors":false,"publicationDate":"1981-01-01","publicationStatus":"PW","scienceBaseUri":"59536ee2e4b062508e3c7b31","contributors":{"authors":[{"text":"Carter, L. David","contributorId":16827,"corporation":false,"usgs":true,"family":"Carter","given":"L.","email":"","middleInitial":"David","affiliations":[],"preferred":false,"id":701356,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Galloway, John","contributorId":47038,"corporation":false,"usgs":true,"family":"Galloway","given":"John","affiliations":[],"preferred":false,"id":701357,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70197669,"text":"70197669 - 1981 - A geologic reconnaissance of the Cycladic blueschist belt, Greece","interactions":[],"lastModifiedDate":"2018-06-15T14:46:54","indexId":"70197669","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1723,"text":"GSA Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"A geologic reconnaissance of the Cycladic blueschist belt, Greece","docAbstract":"<p>The Cycladic blueschist belt consists of two distinctive segments separated by a broad zone of superposed granitic and high-temperature metamorphic rocks. The northern segment contains early metamorphic fold axes and parallel glaucophane lineations that trend ∼060° with a progressive increase in metamorphism toward the southeast. The southern segment contains similar fold axes and glaucophane lineations that trend ∼010° with an apparent increase in metamorphism toward the northwest. Radiometric dating of metamorphic minerals from both segments give apparent ages of about 40 to 80 m.y.</p><p>These data suggest the existence of late Mesozoic or early Cenozoic subduction zones in the Aegean region that subsequently collided.</p>","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(1981)92<247:AGROTC>2.0.CO;2","usgsCitation":"Blake, M.C., Bonneau, M., Geyssant, J., Kienast, J., Lepvrier, C., Maluski, H., and Papanikolaou, D., 1981, A geologic reconnaissance of the Cycladic blueschist belt, Greece: GSA Bulletin, v. 92, no. 5, p. 247-254, https://doi.org/10.1130/0016-7606(1981)92<247:AGROTC>2.0.CO;2.","productDescription":"8 p.","startPage":"247","endPage":"254","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":355090,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"5","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":738133,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bonneau, Michel","contributorId":205690,"corporation":false,"usgs":false,"family":"Bonneau","given":"Michel","email":"","affiliations":[],"preferred":false,"id":738134,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Geyssant, Jacques","contributorId":205691,"corporation":false,"usgs":false,"family":"Geyssant","given":"Jacques","email":"","affiliations":[],"preferred":false,"id":738135,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Kienast, J.R.","contributorId":205692,"corporation":false,"usgs":false,"family":"Kienast","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":738136,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Lepvrier, Claude","contributorId":205693,"corporation":false,"usgs":false,"family":"Lepvrier","given":"Claude","email":"","affiliations":[],"preferred":false,"id":738137,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Maluski, Henri","contributorId":205694,"corporation":false,"usgs":false,"family":"Maluski","given":"Henri","email":"","affiliations":[],"preferred":false,"id":738138,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Papanikolaou, Dimitrios","contributorId":205695,"corporation":false,"usgs":false,"family":"Papanikolaou","given":"Dimitrios","email":"","affiliations":[],"preferred":false,"id":738139,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}}
,{"id":70198196,"text":"70198196 - 1981 - In the southwest: Tectonic evolution reviewed","interactions":[],"lastModifiedDate":"2018-07-20T09:55:50","indexId":"70198196","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1829,"text":"Geotimes","active":true,"publicationSubtype":{"id":10}},"title":"In the southwest: Tectonic evolution reviewed","docAbstract":"<p>No abstract available.</p>","language":"English","publisher":"American Geological Institute","usgsCitation":"Miller, D., Howard, K.A., and Carr, M.D., 1981, In the southwest: Tectonic evolution reviewed: Geotimes, v. 26, no. 4, p. 16-18.","productDescription":"3 p.","startPage":"16","endPage":"18","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":355831,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Miller, D. M. 0000-0003-3711-0441","orcid":"https://orcid.org/0000-0003-3711-0441","contributorId":104422,"corporation":false,"usgs":true,"family":"Miller","given":"D. M.","affiliations":[],"preferred":false,"id":740528,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Howard, Keith A. 0000-0002-6462-2947 khoward@usgs.gov","orcid":"https://orcid.org/0000-0002-6462-2947","contributorId":3439,"corporation":false,"usgs":true,"family":"Howard","given":"Keith","email":"khoward@usgs.gov","middleInitial":"A.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":740529,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Carr, M. D.","contributorId":51767,"corporation":false,"usgs":true,"family":"Carr","given":"M.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":740530,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"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":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":70197136,"text":"70197136 - 1981 - Currents and sediment movement on Georges Bank","interactions":[],"lastModifiedDate":"2018-05-18T10:53:20","indexId":"70197136","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Currents and sediment movement on Georges Bank","docAbstract":"<p>No abstract available.</p>","largerWorkTitle":"Oceans 81: The ocean an international workplace conference record","conferenceTitle":"Oceans 81: The ocean an international workplace","conferenceDate":"September 16-18, 1981","conferenceLocation":"Boston, Massachusetts","language":"English","publisher":"Institute of Electrical and Electronics Engineers","publisherLocation":"Piscataway, NJ","usgsCitation":"Butman, B., 1981, Currents and sediment movement on Georges Bank, <i>in</i> Oceans 81: The ocean an international workplace conference record, Boston, Massachusetts, September 16-18, 1981.","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":354303,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5aff44a2e4b0da30c1bfdb1c","contributors":{"authors":[{"text":"Butman, Bradford 0000-0002-4174-2073 bbutman@usgs.gov","orcid":"https://orcid.org/0000-0002-4174-2073","contributorId":943,"corporation":false,"usgs":true,"family":"Butman","given":"Bradford","email":"bbutman@usgs.gov","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":735788,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188677,"text":"70188677 - 1981 - Decontaminating and recycling zinc bromide solution used in sink-float separation of kerogen","interactions":[],"lastModifiedDate":"2017-06-21T09:15:47","indexId":"70188677","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2451,"text":"Journal of Sedimentary Research","onlineIssn":"1938-3681","printIssn":"1527-1404","active":true,"publicationSubtype":{"id":10}},"title":"Decontaminating and recycling zinc bromide solution used in sink-float separation of kerogen","docAbstract":"<p>No abstract available</p>","language":"English","publisher":"SEPM Society for Sedimentary Geology","doi":"10.1306/212F7D47-2B24-11D7-8648000102C1865D","usgsCitation":"Barker, C., 1981, Decontaminating and recycling zinc bromide solution used in sink-float separation of kerogen: Journal of Sedimentary Research, v. 51, no. 2, p. 666-667, https://doi.org/10.1306/212F7D47-2B24-11D7-8648000102C1865D.","productDescription":"2 p.","startPage":"666","endPage":"667","costCenters":[],"links":[{"id":342700,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"51","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"594b85bae4b062508e382bd7","contributors":{"authors":[{"text":"Barker, Charles E.","contributorId":93070,"corporation":false,"usgs":true,"family":"Barker","given":"Charles E.","affiliations":[],"preferred":false,"id":698874,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70188934,"text":"70188934 - 1981 - The National Coal Resources Data System: A status report","interactions":[],"lastModifiedDate":"2017-06-27T15:54:42","indexId":"70188934","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":"The National Coal Resources Data System: A status report","docAbstract":"<p id=\"p-1\">The National Coal Resources Data System (NCRDS) of the U.S. Geological Survey is an interactive computerized storage, retrieval, and display system to assess the quantity and quality of the nation's coal resources. It has been developed to provide geological coal-resource data currently available, to update that data, and to expand to new types of data.</p><p id=\"p-2\">To this end the U.S. Geological Survey has initiated a 5- to 10-yr program to acquire point-source data for all coal-bearing regions through its own programs and cooperative projects with state agencies. Presently, files containing summary areal coal-tonnage estimates and proximate/ultimate chemical analyses, as well as point-located major-, minor-, and trace-element analyses, and stratigraphic data are available. New resource assessments can be made with point-source data, including drill-hole records, field measurements, and so on. Data may be displayed in literal form or graphically — for example, tables, isoline maps, and cross sections. The system software can calculate coal-resource estimates, generate overburden or interburden distribution, and delineate areas of coal with selected parameters (for example, &lt; .3% sulfur, &gt; 28 in.) within specified boundaries (for example, quadrangle, county).</p>","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(1981)92<563:TNCRDS>2.0.CO;2","usgsCitation":"Carter, M., Medlin, A.L., and Krohn, K.K., 1981, The National Coal Resources Data System: A status report: Geological Society of America Bulletin, v. 92, no. 8, p. 563-573, https://doi.org/10.1130/0016-7606(1981)92<563:TNCRDS>2.0.CO;2.","productDescription":"11 p.","startPage":"563","endPage":"573","costCenters":[],"links":[{"id":343035,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59536ee2e4b062508e3c7b2f","contributors":{"authors":[{"text":"Carter, M. Devereaux","contributorId":85218,"corporation":false,"usgs":true,"family":"Carter","given":"M. Devereaux","affiliations":[],"preferred":false,"id":701358,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Medlin, Antoinette L.","contributorId":84370,"corporation":false,"usgs":true,"family":"Medlin","given":"Antoinette","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":701359,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Krohn, Kathleen K.","contributorId":38156,"corporation":false,"usgs":true,"family":"Krohn","given":"Kathleen","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":701360,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"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":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":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":70188987,"text":"70188987 - 1981 - Modeling natural gas reservoirs: A simple model","interactions":[],"lastModifiedDate":"2017-06-28T11:29:16","indexId":"70188987","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3411,"text":"Society of Petroleum Engineers journal","active":true,"publicationSubtype":{"id":10}},"title":"Modeling natural gas reservoirs: A simple model","docAbstract":"<p><span>A mathematical model is developed and tested for the production of natural gas with water encroachment and gas entrapment. The model is built on the material and volumetric balance relations, the Schilthuis water drive model, and a gas entrapment mechanism which assumes that the rate of gas entrapment is proportional to the volumetric rate of water influx. This model represents an alternative to the large grid models because of its low computer, maintenance, and manpower costs.</span></p>","language":"English","publisher":"Society of Petroleum Engineers","doi":"10.2118/9024-PA","usgsCitation":"Collier, R.S., and Monash, E., 1981, Modeling natural gas reservoirs: A simple model: Society of Petroleum Engineers journal, v. 21, no. 5, p. 521-526, https://doi.org/10.2118/9024-PA.","productDescription":"6 p.","startPage":"521","endPage":"526","costCenters":[],"links":[{"id":343073,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"21","issue":"5","noUsgsAuthors":false,"publicationDate":"1981-10-01","publicationStatus":"PW","scienceBaseUri":"59660f16e4b0d1f9f05cef30","contributors":{"authors":[{"text":"Collier, Richard S.","contributorId":193830,"corporation":false,"usgs":false,"family":"Collier","given":"Richard","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":702290,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Monash, E.A.","contributorId":9527,"corporation":false,"usgs":true,"family":"Monash","given":"E.A.","email":"","affiliations":[],"preferred":false,"id":702291,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"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":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":70188745,"text":"70188745 - 1981 - Changes in the Seismicity and Focal Mechanism of Small Earthquakes Prior to an MS 6.7 Earthquake in the Central Aleutian Island Arc","interactions":[],"lastModifiedDate":"2017-06-22T15:24:10","indexId":"70188745","displayToPublicDate":"1981-12-31T00:00:00","publicationYear":"1981","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Changes in the Seismicity and Focal Mechanism of Small Earthquakes Prior to an MS 6.7 Earthquake in the Central Aleutian Island Arc","docAbstract":"<div><div id=\"abstract\"><div class=\"para\"><p>On November 4 1977, a magnitude M<sub>s</sub> 6.7 (m<sub>b</sub> 5.7) shallow-focus thrust earthquake occurred in the vicinity of the Adak seismographic network in the central Aleutian island arc. The earthquake and its aftershock sequence occurred in an area that had not experienced a similar sequence since at least 1964. About 13 1/2 months before the main shock, the rate of occurrence of very small magnitude earthquakes increased abruptly in the immediate vicinity of the impending main shock. To search for possible variations in the focal mechanism of small events preceding the main shock, a method was developed that objectively combines first-motion data to generate composite focal-mechanism information about events occurring within a small source region. The method could not be successfully applied to the whole study area, but the results show that starting about 10 1/2 months before the November 1977 earthquake, there was a change in the mechanism of small- to moderate-sized earthquakes in the immediate vicinity of the hypocenter and possibly in other parts of the eventual aftershock zone, but not in the surrounding regions.</p></div></div></div>","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Earthquake prediction—Addresses, essays, lectures","language":"English","publisher":"American Geophysical Union","doi":"10.1029/ME004p0348","usgsCitation":"Billington, S., Engdahl, E., and Price, S., 1981, Changes in the Seismicity and Focal Mechanism of Small Earthquakes Prior to an MS 6.7 Earthquake in the Central Aleutian Island Arc, chap. <i>of</i> Earthquake prediction—Addresses, essays, lectures, v. 4, p. 348-356, https://doi.org/10.1029/ME004p0348.","productDescription":"9 p.","startPage":"348","endPage":"356","costCenters":[],"links":[{"id":342782,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"4","noUsgsAuthors":false,"publicationDate":"2013-03-20","publicationStatus":"PW","scienceBaseUri":"594cd744e4b062508e395202","contributors":{"authors":[{"text":"Billington, Serena","contributorId":193280,"corporation":false,"usgs":false,"family":"Billington","given":"Serena","email":"","affiliations":[],"preferred":false,"id":699597,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Engdahl, E.R.","contributorId":22906,"corporation":false,"usgs":true,"family":"Engdahl","given":"E.R.","email":"","affiliations":[],"preferred":false,"id":699598,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Price, Stephanie","contributorId":193281,"corporation":false,"usgs":false,"family":"Price","given":"Stephanie","email":"","affiliations":[],"preferred":false,"id":699599,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"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":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":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":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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