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","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/gp856","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1973, Aeromagnetic map of the Middletown quadrangle, Middlesex, Hartford, and New Haven Counties, Connecticut: U.S. Geological Survey Geophysical Investigations Map 856, 1 Plate: 20.31 x 30.57 inches, https://doi.org/10.3133/gp856.","productDescription":"1 Plate: 20.31 x 30.57 inches","costCenters":[],"links":[{"id":492210,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_6209.htm","linkFileType":{"id":5,"text":"html"}},{"id":250210,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/gp/0856/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":250209,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gp/0856/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":253670,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gp/0856/report-thumb.jpg"}],"scale":"24000","country":"United States","state":"Connecticut","county":"Hartford County, Middlesex County, New Haven County","otherGeospatial":"Middletown quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -72.75,\n 41.625\n ],\n [\n -72.75,\n 41.5\n ],\n [\n -72.625,\n 41.5\n ],\n [\n -72.625,\n 41.625\n ],\n [\n -72.75,\n 41.625\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4af4e4b07f02db691de7","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":533370,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":65710,"text":"i848B - 1973 - Land and coal ownership in the Gillette area, Wyoming","interactions":[],"lastModifiedDate":"2025-08-08T20:52:57.882949","indexId":"i848B","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":320,"text":"IMAP","code":"I","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"848","chapter":"B","title":"Land and coal ownership in the Gillette area, Wyoming","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/i848B","usgsCitation":"U.S. Geological Survey, 1973, Land and coal ownership in the Gillette area, Wyoming: U.S. Geological Survey IMAP 848, 1 Plate: 40.89 x 27.58 inches, https://doi.org/10.3133/i848B.","productDescription":"1 Plate: 40.89 x 27.58 inches","costCenters":[],"links":[{"id":493909,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_9706.htm","linkFileType":{"id":5,"text":"html"}},{"id":255479,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/imap/0848b/report-thumb.jpg"},{"id":255478,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/imap/0848b/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":255477,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/imap/0848b/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"250000","country":"United States","state":"Wyoming","city":"Gillette","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -105.789,\n 44.614\n ],\n [\n -105.789,\n 43.992\n ],\n [\n -105.089,\n 43.992\n ],\n [\n -105.089,\n 44.614\n ],\n [\n -105.789,\n 44.614\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b31e4b07f02db6b41e7"} ,{"id":64033,"text":"gp876 - 1973 - Aeromagnetic map of part of the Clinton quadrangle, Middlesex and New Haven Counties, Connecticut","interactions":[],"lastModifiedDate":"2025-07-15T21:19:18.059301","indexId":"gp876","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":317,"text":"Geophysical Investigations Map","code":"GP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"876","title":"Aeromagnetic map of part of the Clinton quadrangle, Middlesex and New Haven Counties, Connecticut","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/gp876","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1973, Aeromagnetic map of part of the Clinton quadrangle, Middlesex and New Haven Counties, Connecticut: U.S. Geological Survey Geophysical Investigations Map 876, 1 Plate: 20.57 x 29.34 inches, https://doi.org/10.3133/gp876.","productDescription":"1 Plate: 20.57 x 29.34 inches","costCenters":[],"links":[{"id":250466,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/gp/0876/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":250465,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gp/0876/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":253963,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gp/0876/report-thumb.jpg"},{"id":492324,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_6229.htm","linkFileType":{"id":5,"text":"html"}}],"scale":"24000","otherGeospatial":"Clinton quadrangle, Middlesex and New Haven Counties, Connecticut","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -72.61749999999999,41.25 ], [ -72.61749999999999,41.3675 ], [ -72.5,41.3675 ], [ -72.5,41.25 ], [ -72.61749999999999,41.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4affe4b07f02db697a40","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":533502,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":61583,"text":"gq1067 - 1973 - Geologic map of the Midway quadrangle, Washington County, southwestern Pennsylvania","interactions":[],"lastModifiedDate":"2012-02-10T00:10:30","indexId":"gq1067","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":316,"text":"Geologic Quadrangle","code":"GQ","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1067","title":"Geologic map of the Midway quadrangle, Washington County, southwestern Pennsylvania","language":"ENGLISH","doi":"10.3133/gq1067","usgsCitation":"Roen, J.B., 1973, Geologic map of the Midway quadrangle, Washington County, southwestern Pennsylvania: U.S. Geological Survey Geologic Quadrangle 1067, 1 map., https://doi.org/10.3133/gq1067.","productDescription":"1 map.","costCenters":[],"links":[{"id":107510,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_10612.htm","linkFileType":{"id":5,"text":"html"},"description":"10612"},{"id":247892,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gq/1067/report.pdf","size":"34","linkFileType":{"id":1,"text":"pdf"}},{"id":252317,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gq/1067/report-thumb.jpg"}],"scale":"24000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -80.36749999999999,40.25 ], [ -80.36749999999999,40.3675 ], [ -80.25,40.3675 ], [ -80.25,40.25 ], [ -80.36749999999999,40.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4afce4b07f02db6969f6","contributors":{"authors":[{"text":"Roen, John B.","contributorId":14425,"corporation":false,"usgs":true,"family":"Roen","given":"John","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":266096,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":63879,"text":"gp858 - 1973 - Aeromagnetic map of the Moodus quadrangle, Middlesex, New London, Hartford, and Tolland Counties, Connecticut","interactions":[],"lastModifiedDate":"2025-07-14T21:12:15.035838","indexId":"gp858","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":317,"text":"Geophysical Investigations Map","code":"GP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"858","title":"Aeromagnetic map of the Moodus quadrangle, Middlesex, New London, Hartford, and Tolland Counties, Connecticut","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/gp858","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1973, Aeromagnetic map of the Moodus quadrangle, Middlesex, New London, Hartford, and Tolland Counties, Connecticut: U.S. Geological Survey Geophysical Investigations Map 858, 1 Plate: 20.22 x 30.41 inches, https://doi.org/10.3133/gp858.","productDescription":"1 Plate: 20.22 x 30.41 inches","costCenters":[],"links":[{"id":492212,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_6211.htm","linkFileType":{"id":5,"text":"html"}},{"id":253648,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gp/0858/report-thumb.jpg"},{"id":250164,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gp/0858/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":250165,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/gp/0858/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"24000","country":"United States","state":"Connecticut","county":"Hartford County, Middlesex County, New London County, Tolland County","otherGeospatial":"Moodus quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -72.375,\n 41.5\n ],\n [\n -72.375,\n 41.625\n ],\n [\n -72.5,\n 41.625\n ],\n [\n -72.5,\n 41.5\n ],\n [\n -72.375,\n 41.5\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4af4e4b07f02db691d4c","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":533348,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":41943,"text":"ofr73138 - 1973 - Analog-model studies of the effects of recharge wells along the Houston Ship Channel on potentiometric surfaces of the Chicot and Evangeline aquifers, Houston, Texas","interactions":[],"lastModifiedDate":"2016-08-23T16:37:52","indexId":"ofr73138","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","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":"73-138","title":"Analog-model studies of the effects of recharge wells along the Houston Ship Channel on potentiometric surfaces of the Chicot and Evangeline aquifers, Houston, Texas","docAbstract":"Because of increasing concern about the continuing decline of water levels in the Houston area, an electric analog model was used to determine the effects on the potentiometric surfaces resulting from recharging water through wells along the Houston Ship Channel into the two major aquifers, the Chicot and Evangeline.
The model conditions simulated for this study are too complex to be described in detail. The upper model layer simulated the hydrologic conditions in the lower unit of the Chicot aquifer undifferentiated. The simulation included clay compaction and vertical leakage as well as transmissivity and storage. The lower model layer simulated the hydrologic conditions in the Evangeline aquifer which underlies the Chicot aquifer.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr73138","collaboration":"Prepared in cooperation with the City of Houston and Texas Water Development Board","usgsCitation":"Jorgensen, D.G., 1973, Analog-model studies of the effects of recharge wells along the Houston Ship Channel on potentiometric surfaces of the Chicot and Evangeline aquifers, Houston, Texas: U.S. Geological Survey Open-File Report 73-138, 2 Plates: 15.48 x 21.26 inches x 15.78 x 21.23 inches, https://doi.org/10.3133/ofr73138.","productDescription":"2 Plates: 15.48 x 21.26 inches x 15.78 x 21.23 inches","costCenters":[{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"links":[{"id":327758,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr73138.JPG"},{"id":79670,"rank":399,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1973/0138/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":79671,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1973/0138/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Texas","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad5e4b07f02db683991","contributors":{"authors":[{"text":"Jorgensen, D. G.","contributorId":104527,"corporation":false,"usgs":true,"family":"Jorgensen","given":"D.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":225753,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":63874,"text":"gp885 - 1973 - Aeromagnetic map of the Norlina Quadrangle and parts of the Castalia and South Hill quadrangles, north-central North Carolina","interactions":[],"lastModifiedDate":"2012-02-10T00:11:00","indexId":"gp885","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":317,"text":"Geophysical Investigations Map","code":"GP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"885","title":"Aeromagnetic map of the Norlina Quadrangle and parts of the Castalia and South Hill quadrangles, north-central North Carolina","language":"ENGLISH","doi":"10.3133/gp885","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1973, Aeromagnetic map of the Norlina Quadrangle and parts of the Castalia and South Hill quadrangles, north-central North Carolina: U.S. Geological Survey Geophysical Investigations Map 885, 1 map., https://doi.org/10.3133/gp885.","productDescription":"1 map.","costCenters":[],"links":[{"id":105383,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_6237.htm","linkFileType":{"id":5,"text":"html"},"description":"6237"},{"id":187108,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"62500","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -78.25,36.1175 ], [ -78.25,36.55 ], [ -78,36.55 ], [ -78,36.1175 ], [ -78.25,36.1175 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4af3e4b07f02db691c0a","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":533343,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":63881,"text":"gp864 - 1973 - Aeromagnetic map of the Mount Carmel quadrangle, New Haven County, Connecticut","interactions":[],"lastModifiedDate":"2025-07-15T20:02:19.467433","indexId":"gp864","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":317,"text":"Geophysical Investigations Map","code":"GP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"864","title":"Aeromagnetic map of the Mount Carmel quadrangle, New Haven County, Connecticut","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/gp864","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1973, Aeromagnetic map of the Mount Carmel quadrangle, New Haven County, Connecticut: U.S. Geological Survey Geophysical Investigations Map 864, 1 Plate: 21.03 x 30.60 inches, https://doi.org/10.3133/gp864.","productDescription":"1 Plate: 21.03 x 30.60 inches","costCenters":[],"links":[{"id":492314,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_6217.htm","linkFileType":{"id":5,"text":"html"}},{"id":250169,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/gp/0864/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":250168,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gp/0864/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":253650,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gp/0864/report-thumb.jpg"}],"scale":"24000","country":"United States","state":"Connecticut","county":"New Haven County","otherGeospatial":"Mount Carmel quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -73,\n 41.5\n ],\n [\n -73,\n 41.375\n ],\n [\n -72.875,\n 41.375\n ],\n [\n -72.875,\n 41.5\n ],\n [\n -73,\n 41.5\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4af4e4b07f02db691d48","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":533350,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":63951,"text":"gp866 - 1973 - Aeromagnetic map of the Durham quadrangle, Middlesex and New Haven Counties, Connecticut","interactions":[],"lastModifiedDate":"2025-07-15T20:16:06.138298","indexId":"gp866","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1973","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":317,"text":"Geophysical Investigations Map","code":"GP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"866","title":"Aeromagnetic map of the Durham quadrangle, Middlesex and New Haven Counties, Connecticut","docAbstract":"No abstract available.
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Rocks of the type Montana Group in Montana and equivalent rocks in adjacent States, which consist of eastward-pointing wedges of shallow-water marine and nonmarine strata that enclose westward-pointing wedges of fine-grained marine strata, were deposited in and marginal to this sea. These rocks range in age from middle Santonian to early Maestrichtian and represent a time span of about 14 million years. Twenty-nine distinctive ammonite zones, each with a time span of about half a million years, characterize the marine strata.
Persistent beds of bentonite in the transgressive part of the Claggett and Bearpaw Shales of Montana and equivalent rocks elsewhere represent periods of explosive volcanism and perhaps concurrent subsidence along the west shore in the vicinity of the Elkhorn Mountains and the Deer Creek volcanic fields in Montana. Seaward retreat of st randlines, marked by deposition of the Telegraph Creek, Eagle, Judith River, and Fox Hills Formations in Montana and the Mesaverde Formation in Wyoming, may be attributed to uplift in near-coastal areas and to an increase in volcaniclastic rocks delivered to the sea.
Rates of transgression and regression determined for the Montana Group in central Montana reveal that the strandline movement was more rapid during times of transgression. The regression of the Telegraph Creek and Eagle strandlines averaged about 50 miles per million years compared with a rate of about 95 miles per million years for the advance of the strand-line during Claggett time. The Judith River regression averaged about 60 miles per million years compared with movement of the strandline during the Bearpaw advance of about 70 miles per million years.
The final retreat of marine waters from Montana, marked by the Fox Hills regression, was about 35 miles per million years at first, but near the end of the regression it accelerated to a rate of about 500 miles per million years.
Rates of sedimentation range from less than 50 feet per million years in the eastern parts of North and South Dakota to at least 2,500 feet in western Wyoming. The low rates in the Dakotas correspond well with modern rates in the open ocean, and the rates in western Wyoming approach the rate of present coastal sedimentation.
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","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/i792B","usgsCitation":"Covington, H., and Gable, D.J., 1973, Map showing density of dwelling units in the Tungsten quadrangle, Boulder, Gilpin, and Jefferson Counties, Colorado: U.S. Geological Survey IMAP 792, 1 Plate: 28.14 x 26.76 inches, https://doi.org/10.3133/i792B.","productDescription":"1 Plate: 28.14 x 26.76 inches","costCenters":[],"links":[{"id":493881,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_9629.htm","linkFileType":{"id":5,"text":"html"}},{"id":254840,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/imap/0792b/report-thumb.jpg"},{"id":254839,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/imap/0792b/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":254838,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/imap/0792b/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"24000","country":"United States","state":"Colorado","county":"Boulder County , Gilpin County, Jefferson County","otherGeospatial":"Tungsten quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -105.375,\n 39.875\n ],\n [\n -105.375,\n 40\n ],\n [\n -105.5,\n 40\n ],\n [\n -105.5,\n 39.875\n ],\n [\n -105.375,\n 39.875\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a94e4b07f02db6591d9","contributors":{"authors":[{"text":"Covington, H. 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This report encompasses the results of geologic and geochemical investigations made in a 40 square kilometer area located on the southeast perimeter of the ring structure, an area where previous geochemical exploration revealed anomalous tungsten and molybdenum values. \r\n\r\nIgneous rocks exposed in the area include batholithic plutonic rocks, intrusive rocks of the ring dike, hypabyssal dike rocks, and late epithermal quartz veins; remnants of metamorphosed, prebatholithic rocks are also exposed. About two-thirds of the area is covered with a veneer of surficial debris. Structural patterns of the area are dominated by the ring structure. \r\n\r\nThe principal mineralization consists of powellite and scheelite in high-temperature, quartz-rich veinlets and pods and in contact metamorphic rocks. Although the areas of metallization account for the previously discovered sediment geochemical anomalies, mineralization is sparse, and no currently valuable mineral deposits are known or thought to be present in the area.","language":"ENGLISH","publisher":"U.S. Geological Survey],","doi":"10.3133/ofr7360","usgsCitation":"Dodge, F.C., 1973, Geology and evaluation of tungsten anomalies, Buhairan-Abu Khurg area, southeastern part of the Uyaijah ring structure, Kingdom of Saudi Arabia: U.S. Geological Survey Open-File Report 73-60, ii, 32 p. :ill., folded col. map ;28 cm., https://doi.org/10.3133/ofr7360.","productDescription":"ii, 32 p. :ill., folded col. map ;28 cm.","costCenters":[],"links":[{"id":146649,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1973/0060/report-thumb.jpg"},{"id":41791,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/1973/0060/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":41792,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1973/0060/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adce4b07f02db686253","contributors":{"authors":[{"text":"Dodge, F. 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