{"pageNumber":"4016","pageRowStart":"100375","pageSize":"25","recordCount":184938,"records":[{"id":70182832,"text":"70182832 - 1994 - Geology of south-central Alaska","interactions":[],"lastModifiedDate":"2017-06-07T16:28:08","indexId":"70182832","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"10","title":"Geology of south-central Alaska","docAbstract":"

South-central Alaska is defined as the region bounded by the Kuskokwim Mountains to the northwest, the basins north of the Alaska Range to the north, the Canadian border to the east, and the Chugach Mountains to the south (Fig. 1). This region, hereafter called the study area, includes the Alaska Range, the Wrangell, Nutzotin, and Talkeetna mountains, the Copper River and the Susitna basins, the northern flank of the Chugach Mountains, the Aleutian Range, and the Alaska Peninsula. This chapter describes and interprets the bedrock geology of the region, which consists mostly of a collage of Paleozoic and Mesozoic tectonostratigraphic terranes (hereafter referred to as terranes), Mesozoic flysch basin deposits, late Paleozoic and Mesozoic plutonic rocks, and younger late Mesozoic and Cenozoic sedimentary, volcanic, and plutonic rocks. Cited published sources and new data and interpretations of the authors are utilized for the descriptions and interpretations. The terranes, flysch basin deposits, and younger Mesozoic sedimentary, volcanic, and plutonic assemblages are described first in a general northwest to southeast order. Major faults or sutures are described second. Stratigraphic linkages and structural and tectonic relations between terranes are described last. Definitions of the various stratigraphic, structural, and tectonic terms are stated at the end of this introduction.

","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The geology of Alaska: Volume G-1 of Decade of North American Geology","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Geological Society of America","usgsCitation":"Nokleberg, W.J., Plafker, G., and Wilson, F.H., 1994, Geology of south-central Alaska, chap. 10 of The geology of Alaska: Volume G-1 of Decade of North American Geology, v. G-1, p. 311-366.","productDescription":"56 p.","startPage":"311","endPage":"366","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":336387,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -162,\n 64\n ],\n [\n -141,\n 64\n ],\n [\n -141,\n 59\n ],\n [\n -151.75,\n 59\n ],\n [\n -151.75,\n 58\n ],\n [\n -152,\n 58\n ],\n [\n -152,\n 57\n ],\n [\n -154,\n 57\n ],\n [\n -154,\n 56\n ],\n [\n -158,\n 56\n ],\n [\n -158,\n 55\n ],\n [\n -158.5,\n 55\n ],\n [\n -158.5,\n 54\n ],\n [\n -161,\n 54\n ],\n [\n -161,\n 55\n ],\n [\n -162,\n 55\n ],\n [\n -162,\n 54\n ],\n [\n -164,\n 54\n ],\n [\n -164,\n 56\n ],\n [\n -161,\n 56\n ],\n [\n -161,\n 57\n ],\n [\n -159.5,\n 57\n ],\n [\n -159.5,\n 58\n ],\n [\n -162.25,\n 58\n ],\n [\n -162.25,\n 59\n ],\n [\n -162,\n 59\n ],\n \n [\n -162,\n 64\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"G-1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58b69a44e4b01ccd54ff3fd8","contributors":{"authors":[{"text":"Nokleberg, Warren J. 0000-0002-1574-8869 wnokleberg@usgs.gov","orcid":"https://orcid.org/0000-0002-1574-8869","contributorId":2077,"corporation":false,"usgs":true,"family":"Nokleberg","given":"Warren","email":"wnokleberg@usgs.gov","middleInitial":"J.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":673942,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Plafker, George","contributorId":3920,"corporation":false,"usgs":false,"family":"Plafker","given":"George","email":"","affiliations":[],"preferred":false,"id":673943,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wilson, Frederic H. 0000-0003-1761-6437 fwilson@usgs.gov","orcid":"https://orcid.org/0000-0003-1761-6437","contributorId":67174,"corporation":false,"usgs":true,"family":"Wilson","given":"Frederic","email":"fwilson@usgs.gov","middleInitial":"H.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"preferred":true,"id":673944,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70182997,"text":"70182997 - 1994 - Geology of Seward Peninsula and Saint Lawrence Island","interactions":[],"lastModifiedDate":"2018-05-07T21:11:28","indexId":"70182997","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"4","title":"Geology of Seward Peninsula and Saint Lawrence Island","docAbstract":"

Seward Peninsula (Fig. 1) may be divided into two geologic terranes (Fig. 2) on the basis of stratigraphy, structure, and metamorphic history. The Seward terrane, an area 150 by 150 km in the central and eastern peninsula, is dominated by Precambrian(?) and early Paleozoic blueschist-, greenschist-, and amphibolite-facies schist and marble, and intruded by three suites of granitic rocks. The York terrane, roughly 100 by 75 km, occupies western Seward Peninsula and the Bering Straits region; it is composed of Ordovician, Silurian, Devonian, Mississippian, and possibly older limestone, argillaceous limestone, dolostone, and phyllite, which are cut by a suite of Late Cretaceous tin-bearing granites. The boundary between the Seward and York terranes is poorly exposed but is thought to be a major thrust fault because of its sinuous map trace, a discontinuity in metamorphic grade, and differences in stratigraphy across the boundary (Travis Hudson, oral communication, 1984). The boundary between the Seward terrane and the Yukon-Koyukuk province to the east is complicated by vertical faults (the Kugruk fault Zone of Sainsbury, 1974) and obscured by Cretaceous and Tertiary cover.

The Seward Peninsula heretofore was thought to consist largely of rocks of Precambrian age (Sainsbury, 1972, 1974, 1975; Hudson, 1977), Microfossil data, however, indicate that many of the rocks considered to be Precambrian are early Paleozoic in age (Till and others, 1986; Dumoulin and Harris, 1984; Dumoulin and Till, 1985; Till and others, 1983; Wandervoort, 1985). It is likely that Precambrian rocks are a minor part of the stratigraphy of the Seward Peninsula.

","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The geology of Alaska: Volume G-1 of Decade of North American Geology","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Geological Society of America","usgsCitation":"Till, A.B., and Dumoulin, J.A., 1994, Geology of Seward Peninsula and Saint Lawrence Island, chap. 4 of The geology of Alaska: Volume G-1 of Decade of North American Geology, v. G-1, p. 141-152.","productDescription":"12 p.","startPage":"141","endPage":"152","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":336410,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Saint Lawrence Island, Seward Peninsula","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -161,\n 64\n ],\n [\n -161,\n 67\n ],\n [\n -169,\n 67\n ],\n [\n -169,\n 64\n ],\n [\n -161,\n 64\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -172.3974609375,\n 62.85514553774182\n ],\n [\n -168.134765625,\n 62.85514553774182\n ],\n [\n -168.134765625,\n 63.93737246791484\n ],\n [\n -172.3974609375,\n 63.93737246791484\n ],\n [\n -172.3974609375,\n 62.85514553774182\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"G-1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58b69a44e4b01ccd54ff3fd4","contributors":{"authors":[{"text":"Till, Alison B. atill@usgs.gov","contributorId":2482,"corporation":false,"usgs":true,"family":"Till","given":"Alison","email":"atill@usgs.gov","middleInitial":"B.","affiliations":[{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"preferred":true,"id":674743,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dumoulin, Julie A. 0000-0003-1754-1287 dumoulin@usgs.gov","orcid":"https://orcid.org/0000-0003-1754-1287","contributorId":203209,"corporation":false,"usgs":true,"family":"Dumoulin","given":"Julie","email":"dumoulin@usgs.gov","middleInitial":"A.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"preferred":true,"id":674744,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":96808,"text":"96808 - 1994 - Diet and diet selection of the desert tortoise (Gopherus agassizii) in the northeast Mojave Desert","interactions":[],"lastModifiedDate":"2012-02-02T00:03:53","indexId":"96808","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":21,"text":"Thesis"},"publicationSubtype":{"id":28,"text":"Thesis"},"title":"Diet and diet selection of the desert tortoise (Gopherus agassizii) in the northeast Mojave Desert","docAbstract":"No abstract available at this time","language":"English","publisher":"Colorado State University","publisherLocation":"Fort Collins, CO","usgsCitation":"Esque, T., 1994, Diet and diet selection of the desert tortoise (Gopherus agassizii) in the northeast Mojave Desert, 243 p.","productDescription":"243 p.","startPage":"243","numberOfPages":"243","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":127382,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a9ae4b07f02db65d899","contributors":{"authors":[{"text":"Esque, T. C. 0000-0002-4166-6234","orcid":"https://orcid.org/0000-0002-4166-6234","contributorId":76250,"corporation":false,"usgs":true,"family":"Esque","given":"T. C.","affiliations":[],"preferred":false,"id":300310,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":33962,"text":"b2082 - 1994 - Geochemical survey of the Craig study area: Craig and Dixon Entrance quadrangles and the western edges of the Ketchikan and Prince Rupert quadrangles, southeast Alaska","interactions":[],"lastModifiedDate":"2022-12-21T19:25:06.441722","indexId":"b2082","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":306,"text":"Bulletin","code":"B","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2082","title":"Geochemical survey of the Craig study area: Craig and Dixon Entrance quadrangles and the western edges of the Ketchikan and Prince Rupert quadrangles, southeast Alaska","docAbstract":"

No abstract available.

","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/b2082","usgsCitation":"Cathrall, J.B., 1994, Geochemical survey of the Craig study area: Craig and Dixon Entrance quadrangles and the western edges of the Ketchikan and Prince Rupert quadrangles, southeast Alaska: U.S. Geological Survey Bulletin 2082, Report: vi, 52 p.; 1 Plate: 50.33 × 31.49 inches, https://doi.org/10.3133/b2082.","productDescription":"Report: vi, 52 p.; 1 Plate: 50.33 × 31.49 inches","costCenters":[],"links":[{"id":247452,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/2082/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":247451,"rank":1,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/2082/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":251854,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/2082/report-thumb.jpg"},{"id":109827,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_22379.htm","linkFileType":{"id":5,"text":"html"},"description":"22379"}],"country":"United States","state":"Alaska","otherGeospatial":"Craig and Dixon Entrance quadrangles and the western edges of the Ketchikan and Prince Rupert quadrangles","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -131.5,\n 56\n ],\n [\n -134.667,\n 56\n ],\n [\n -134.667,\n 54.658\n ],\n [\n -131.5,\n 54.658\n ],\n [\n -131.5,\n 56\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b20e4b07f02db6abab9","contributors":{"authors":[{"text":"Cathrall, John B.","contributorId":26668,"corporation":false,"usgs":true,"family":"Cathrall","given":"John","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":212240,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":20844,"text":"ofr9469 - 1994 - Water-level measurements, 1986-91, Red River alluvial aquifer, Red River Valley, Louisiana","interactions":[],"lastModifiedDate":"2012-02-02T00:07:40","indexId":"ofr9469","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"94-69","title":"Water-level measurements, 1986-91, Red River alluvial aquifer, Red River Valley, Louisiana","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nUSGS Earth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/ofr9469","usgsCitation":"Seanor, R., 1994, Water-level measurements, 1986-91, Red River alluvial aquifer, Red River Valley, Louisiana: U.S. Geological Survey Open-File Report 94-69, iv, 218 p., [1] folded leaf of plates :ill., maps ;28 cm., https://doi.org/10.3133/ofr9469.","productDescription":"iv, 218 p., [1] folded leaf of plates :ill., maps ;28 cm.","costCenters":[],"links":[{"id":152100,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1994/0069/report-thumb.jpg"},{"id":50441,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1994/0069/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":50442,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1994/0069/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49e6e4b07f02db5e7341","contributors":{"authors":[{"text":"Seanor, R. 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In 1991, the U.S. Geological Survey (USGS), U.S. Department of the Interior, began a National Water-Quality Assessment (NAWQA) program. The long-term goals of the NAWQA program are to describe the status and trends of the quality of a large, representative part of the Nation’s surfaceand ground-water resources, and to identify the natural and human factors that affect the quality of these resources. Factors such as geomorphology, climate, hydrology, land use, and land cover that affect water-quality, are being studied relative to specific water-quality issues that affect large hydrologic regions of the United States. In addressing these goals, the NAWQA program will produce water-quality information that will be useful to policy makers and managers at the National, State, and local levels.

\n

Because it would be impractical to assess the water quality in the entire Nation, major activities of the NAWQA program take place within a set of hydrologic systems called study units. Study units at 60 locations comprise diverse hydrologic systems of river basins, aquifer systems, or both, ranging in size from 1,000 mi2 (square miles) to more than 60,000 mi2 . These study units collectively encompass about 45 percent of the land area in the conterminous United States and represent 60 to 70 percent of the Nation’s water use and population served by public water supply.

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No abstract available.

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Water levels measured in September 1993 were generally below those reported for September 1992. In 134 wells with paired measurements, the September 1993 level ranged from 4.86 feet below to 5.91 feet above the September 1992 level and averaged 0.59 foot below the September 1992 level. The general decline in water levels during this period was largely the result of below normal rainfall and above average seasonal ground-water withdrawals.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr9480","usgsCitation":"Mularoni, R.A., 1994, Potentiometric surfaces of the intermediate aquifer system, west-central Florida, September, 1993: U.S. Geological Survey Open-File Report 94-80, 1 Plate: 25.00 × 33.00 inches, https://doi.org/10.3133/ofr9480.","productDescription":"1 Plate: 25.00 × 33.00 inches","costCenters":[],"links":[{"id":168050,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":21529,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1994/0080/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":407337,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_12451.htm","linkFileType":{"id":5,"text":"html"}}],"scale":"500000","projection":"Universal transverse Mercator","country":"United States","state":"Florida","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -84,\n 26.5 \n ],\n [\n -81,\n 26.5\n ],\n [\n -81,\n 29.75\n ],\n [\n -84,\n 29.75\n ],\n [\n -84,\n 26.5\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad3e4b07f02db682210","contributors":{"authors":[{"text":"Mularoni, R. 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No abstract available.

","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr9414B","collaboration":"The USGS does not provide technical support for the software associated with this publication.","usgsCitation":"Morin, R.L., 1994, Principal facts for gravity data in the Bethel and Russian Mission 1 degree x 3 degrees quadrangles, Alaska: U.S. Geological Survey Open-File Report 94-14, 1 CD-ROM, https://doi.org/10.3133/ofr9414B.","productDescription":"1 CD-ROM","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":168049,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":432790,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1994/0014-a/ofr9414A,B.zip","text":"CD-ROM ofr9414A,B","linkFileType":{"id":6,"text":"zip"}}],"country":"United States","state":"Alaska","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -129.7635812346696,\n 72.81739131372794\n ],\n [\n -181.46886449635872,\n 72.81739131372794\n ],\n [\n -181.46886449635872,\n 51.45431066869793\n ],\n [\n -129.7635812346696,\n 51.45431066869793\n ],\n [\n -129.7635812346696,\n 72.81739131372794\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aaae4b07f02db668cf6","contributors":{"authors":[{"text":"Morin, Robert L.","contributorId":82671,"corporation":false,"usgs":true,"family":"Morin","given":"Robert","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":229639,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":44323,"text":"ofr94182B - 1994 - Analytical data for stream sediment, heavy-mineral concentrate, and outcrop samples, Sur Medio region, departments of Ica, Ayacucho, and Huancavelica, Peru; Part B, Printout of analytical data","interactions":[],"lastModifiedDate":"2012-02-02T00:11:00","indexId":"ofr94182B","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"94-182","chapter":"B","title":"Analytical data for stream sediment, heavy-mineral concentrate, and outcrop samples, Sur Medio region, departments of Ica, Ayacucho, and Huancavelica, Peru; Part B, Printout of analytical data","language":"ENGLISH","doi":"10.3133/ofr94182B","usgsCitation":"Learned, R.E., Long, K.R., Turner, R.L., Rios C., C., and Rodriguez C., J., 1994, Analytical data for stream sediment, heavy-mineral concentrate, and outcrop samples, Sur Medio region, departments of Ica, Ayacucho, and Huancavelica, Peru; Part B, Printout of analytical data: U.S. Geological Survey Open-File Report 94-182, 2 v. : map ; 28 cm., https://doi.org/10.3133/ofr94182B.","productDescription":"2 v. : map ; 28 cm.","costCenters":[],"links":[{"id":169204,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1994/0182b/report-thumb.jpg"},{"id":81650,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1994/0182b/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4acee4b07f02db67fd58","contributors":{"authors":[{"text":"Learned, Robert Eugene","contributorId":11627,"corporation":false,"usgs":true,"family":"Learned","given":"Robert","email":"","middleInitial":"Eugene","affiliations":[],"preferred":false,"id":229563,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Long, K. R.","contributorId":94658,"corporation":false,"usgs":true,"family":"Long","given":"K.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":229566,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Turner, R. 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The computer program described in this report provides a new method of simulating transient leakage using the U.S. Geological Survey modular finite- difference ground-water flow model (MODFLOW). The new program is referred to as the Transient- Leakage Package. The Transient-Leakage Package solves integrodifferential equations that describe flow across the upper and lower boundaries of confining units. For each confining unit, vertical hydraulic conductivity, thickness, and specific storage are specified in input arrays. These properties can vary from cell to cell and the confining unit need not be present at all locations in the grid; however, the confining units must be bounded above and below by model layers in which head is calculated or specified. The package was used in an example problem to simulate drawdown around a pumping well in a system with two aquifers separated by a confining unit. For drawdown values in excess of 1 centimeter, the solution using the new package closely matched an exact analytical solution. The problem also was simulated without the new package by using a separate model layer to represent the confining unit. That simulation was refined by using two model layers to represent the confining unit. The simulation using the Transient-Leakage Package was faster and more accurate than either of the simulations using model layers to represent the confining unit.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nUSGS Earth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/ofr9459","usgsCitation":"Leake, S.A., Leahy, P., and Navoy, A., 1994, Documentation of a computer program to simulate transient leakage from confining units using the modular finite-difference, ground-water flow model: U.S. Geological Survey Open-File Report 94-59, vi, 70 p. :ill. ;28 cm., https://doi.org/10.3133/ofr9459.","productDescription":"vi, 70 p. :ill. ;28 cm.","costCenters":[],"links":[{"id":152567,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1994/0059/report-thumb.jpg"},{"id":49274,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1994/0059/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a68e4b07f02db63b0af","contributors":{"authors":[{"text":"Leake, S. 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A liquid chromatographic method is described for the determination of sarafloxacin hydrochloride residues in channel catfish (Ictalurus punctatus) fillets. Sarafloxacin was extracted from fillet tissue with acetonitrile–water (1+1). The extract was centrifuged and the supernatant was partitioned with hexane. The aqueous fraction was filtered through a 0.45 μm filter and evaporated to dryness. The sample was redissolved with 20% acetonitrile–methanol (3 + 2) and 80% trifluoroacetic acid (0.1%), centrifuged, and filtered to remove proteins. Samples were analyzed by chromatography with gradient elution on a C18 column and with fluorescence detection (excitation at 280 nm and emission above 389 nm). Mean recoveries ranged from 85.4 to 104%, and relative standard deviations ranged from 1.06 to 5.58% in samples spiked at concentrations of 10.0–863.8 ng/g. The method detection limit for sarafloxacin was 1.4 ng/g.

","language":"English","publisher":"Oxford Academic","doi":"10.1093/jaoac/77.4.871","issn":"10603271","usgsCitation":"Meinertz, J., Dawson, V.K., Gingerich, W., Cheng, B., and Tubergen, M., 1994, Liquid-chromatographic determination of sarafloxacin residues in channel catfish muscle-tissue: Journal of AOAC International, v. 77, no. 4, p. 871-875, https://doi.org/10.1093/jaoac/77.4.871.","productDescription":"5 p.","startPage":"871","endPage":"875","numberOfPages":"5","costCenters":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"links":[{"id":196934,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"77","issue":"4","noUsgsAuthors":false,"publicationDate":"2020-01-14","publicationStatus":"PW","scienceBaseUri":"4f4e4b15e4b07f02db6a483a","contributors":{"authors":[{"text":"Meinertz, J.R. 0000-0002-8855-2648","orcid":"https://orcid.org/0000-0002-8855-2648","contributorId":16786,"corporation":false,"usgs":true,"family":"Meinertz","given":"J.R.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":false,"id":313374,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dawson, V. K.","contributorId":48900,"corporation":false,"usgs":true,"family":"Dawson","given":"V.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":313376,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gingerich, W.H.","contributorId":83481,"corporation":false,"usgs":true,"family":"Gingerich","given":"W.H.","email":"","affiliations":[],"preferred":false,"id":313377,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cheng, B.","contributorId":37846,"corporation":false,"usgs":true,"family":"Cheng","given":"B.","email":"","affiliations":[],"preferred":false,"id":313375,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Tubergen, M.M.","contributorId":88053,"corporation":false,"usgs":true,"family":"Tubergen","given":"M.M.","email":"","affiliations":[],"preferred":false,"id":313378,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ]}