The McCallum anticlines, embracing an area about 2 miles wide and 12 miles long, are about 6 miles east of the town of Walden, Jackson County, Colo., on the east side of the Continental Divide. A cover of flat-lying Quaternary gravel obscures the outcrop of Pierre shale at many points on the two anticlines. Wells start in the upper part of the Pierre and penetrate all of the underlying Upper Cretaceous series to the top of the Dakota sandstone, where production of oil and carbon dioxide is obtained. The first prospecting for oil was reported in 1912, but it was not until December 1926 that oil was discovered in commercial quantities.
Two geologic sections across the anticlines, extending to the outcrop of the Dakota sandstone at the base of the Medicine Bow Range, to, the east, disclosed a marked thickening between this formation and a fossiliferous sandstone in the Pierre shale which was used as a key bed. Immediately beneath the Dakota sandstone along ore of these cross sections a sandy volcanic ash resembling that found at the horizon of the Mowry shale in Wyoming was discovered. However, it is considered here the top bed of the Morrison formation.
The impossibility of obtaining dips along the crests, owing to the cover of terrace gravel, made it necessary to construct ten structure sections across these anticlines, using the geometry of conic sections in their development. From the geometric figures developed structure contours were obtained graphically.
The occurrence of carbon dioxide in large volumes in association with petroleum on each of these anticlines provides an unusual problem in oil production. Experimental data relative to the physical properties of this gas offer an approach to the solution of the problem. The applicability of such data to actual operating conditions is yet to be tried, but the work of early investigators in the field of physical chemistry suggests the feasibility of mixing air with the carbon dioxide to assure continuity of production, which heretofore has not been attained in this area.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/cir5","usgsCitation":"Miller, J.C., 1934, Geology of the North and South McCallum anticlines, Jackson County, Colorado, with special reference to petroleum and carbon dioxide: U.S. Geological Survey Circular 5, 27 p., https://doi.org/10.3133/cir5.","productDescription":"27 p.","costCenters":[],"links":[{"id":346216,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/0005/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":138384,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/0005/report-thumb.jpg","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Colorado","county":"Jackson County","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -106.63330078125,\n 40.42290582797254\n ],\n [\n -106.32156372070312,\n 40.42290582797254\n ],\n [\n -106.32156372070312,\n 41.00373905329032\n ],\n [\n -106.63330078125,\n 41.00373905329032\n ],\n [\n -106.63330078125,\n 40.42290582797254\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4acce4b07f02db67e908","contributors":{"authors":[{"text":"Miller, John Charles","contributorId":97884,"corporation":false,"usgs":true,"family":"Miller","given":"John","email":"","middleInitial":"Charles","affiliations":[],"preferred":false,"id":147316,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":52851,"text":"b857E - 1934 - Core drilling for coal in the Moose Creek area, Alaska","interactions":[{"subject":{"id":52851,"text":"b857E - 1934 - Core drilling for coal in the Moose Creek area, Alaska","indexId":"b857E","publicationYear":"1934","noYear":false,"chapter":"E","title":"Core drilling for coal in the Moose Creek area, Alaska"},"predicate":"IS_PART_OF","object":{"id":35875,"text":"b857 - 1934 - Mineral resources of Alaska: report on progress of investigations in 1932","indexId":"b857","publicationYear":"1934","noYear":false,"title":"Mineral resources of Alaska: report on progress of investigations in 1932"},"id":1}],"isPartOf":{"id":35875,"text":"b857 - 1934 - Mineral resources of Alaska: report on progress of investigations in 1932","indexId":"b857","publicationYear":"1934","noYear":false,"title":"Mineral resources of Alaska: report on progress of investigations in 1932"},"lastModifiedDate":"2021-08-17T21:00:24.47653","indexId":"b857E","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"857","chapter":"E","title":"Core drilling for coal in the Moose Creek area, Alaska","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/b857E","usgsCitation":"Waring, G.A., 1934, Core drilling for coal in the Moose Creek area, Alaska: U.S. Geological Survey Bulletin 857, Report: 21 p.; 4 Plates: 10.19 × 28.00 or smaller, https://doi.org/10.3133/b857E.","productDescription":"Report: 21 p.; 4 Plates: 10.19 × 28.00 or smaller","costCenters":[],"links":[{"id":388063,"rank":7,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_21029.htm"},{"id":174696,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/0857e/report-thumb.jpg"},{"id":94043,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/0857e/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":114661,"rank":403,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/0857e/plate-9.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":114660,"rank":402,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/0857e/plate-8.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":114659,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/0857e/plate-7.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":114658,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/0857e/plate-6.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Alaska","otherGeospatial":"Moose Creek area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -149.1670,\n 61.6670\n ],\n [\n -148.9000,\n 61.6670\n ],\n [\n -148.9000,\n 61.7670\n ],\n [\n -149.1670,\n 61.7670\n ],\n [\n -149.1670,\n 61.6670\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b08e4b07f02db69b6c7","contributors":{"authors":[{"text":"Waring, Gerald Ashley","contributorId":53362,"corporation":false,"usgs":true,"family":"Waring","given":"Gerald","email":"","middleInitial":"Ashley","affiliations":[],"preferred":false,"id":246098,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":52846,"text":"b844E - 1934 - Mineral resources of Alaska, report on progress of investigations in 1931. Reconnaissance of the northern Koyukuk Valley, Alaska","interactions":[],"lastModifiedDate":"2012-02-02T00:11:45","indexId":"b844E","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"844","chapter":"E","title":"Mineral resources of Alaska, report on progress of investigations in 1931. Reconnaissance of the northern Koyukuk Valley, Alaska","language":"ENGLISH","doi":"10.3133/b844E","usgsCitation":"Marshall, R., 1934, Mineral resources of Alaska, report on progress of investigations in 1931. Reconnaissance of the northern Koyukuk Valley, Alaska: U.S. Geological Survey Bulletin 844, pp. 247-256, 1 plate, sketch map, https://doi.org/10.3133/b844E.","productDescription":"pp. 247-256, 1 plate, sketch map","costCenters":[],"links":[{"id":94038,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/0844e/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":173955,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/0844e/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b08e4b07f02db69b65d","contributors":{"authors":[{"text":"Marshall, Robert","contributorId":107292,"corporation":false,"usgs":true,"family":"Marshall","given":"Robert","affiliations":[],"preferred":false,"id":246091,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":3870,"text":"cir7 - 1934 - Gold-quartz veins south of Libby, Montana","interactions":[],"lastModifiedDate":"2021-03-05T16:53:32.341271","indexId":"cir7","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"7","title":"Gold-quartz veins south of Libby, Montana","docAbstract":"The area described in this paper is one of rugged mountains, composed chiefly of folded and faulted sedimentary rocks of the Belt series. In the nearby region the beds are intruded by diorite sills and granitic stocks. Glacial drift, including silt deposited in a lake, covers much of the lower slopes of the mountains and partly fills the valleys.
Incomplete records show a production of $200,000 in gold, mostly from the oxidized free-milling parts of quartz veins. Except a few in the Wallace formation the veins are found in sandstone and shale of the Prichard formation. They partly replace the country rock along fractures that commonly follow bedding planes but also cut across them at moderate angles. The veins average between 1 and 2 feet in thickness and reach a maximum of 6 feet. They are cut by faults of small displacement, with which the ore bodies are commonly associated.
Quartz forms 95 percent or more of the veins. Of the remainder, one or more of the minerals pyrite, galena, sphalerite, and pyrrhotite are relatively abundant, and chalcopyrite, arsenopyrite, tetrahedrite, and scheelite are present sparingly. A little silver is present, and in some veins it exceeds the gold considerably.
In many veins an original quartz filling has been slightly brecciated or sheared by movement parallel to the walls. Sulphides and gold have been introduced along the shear planes, partly replacing the quartz and giving the vein a \"ribbon\" structure. The gold is closely associated with the sphalerite, and silver is more plentiful in the veins that carry galena.
As a rule oxidation has not extended far below the surface, and its chief product is limonite. Cerusite and anglesite are present in some veins, and a little malachite, azurite, pyromorphite, or manganese oxide occurs in a few. Native gold is present in both the oxidized and unoxidized ores.
Although mining of these veins in the past may have been unprofitable, that result was due partly, at least, to difficulties of transportation and milling. With improvement in roads and methods, not to mention appreciation in the value of gold, the deposits are believed to have a promising future.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/cir7","usgsCitation":"Gibson, R., 1934, Gold-quartz veins south of Libby, Montana: U.S. Geological Survey Circular 7, 25 p., https://doi.org/10.3133/cir7.","productDescription":"25 p.","costCenters":[],"links":[{"id":384090,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/0007/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":139359,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/0007/report-thumb.jpg"}],"country":"United States","state":"Montana","city":"Libby","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -115.66955566406249,\n 48.3416461723746\n ],\n [\n -115.44708251953125,\n 48.3416461723746\n ],\n [\n -115.44708251953125,\n 48.425555463221066\n ],\n [\n -115.66955566406249,\n 48.425555463221066\n ],\n [\n -115.66955566406249,\n 48.3416461723746\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b15e4b07f02db6a4993","contributors":{"authors":[{"text":"Gibson, Russell","contributorId":106101,"corporation":false,"usgs":true,"family":"Gibson","given":"Russell","email":"","affiliations":[],"preferred":false,"id":147762,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":471,"text":"wsp727 - 1934 - Surface water supply of the United States, 1932, Part II, South Atlantic slope and eastern Gulf of Mexico basins","interactions":[],"lastModifiedDate":"2012-02-02T00:05:12","indexId":"wsp727","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":341,"text":"Water Supply Paper","code":"WSP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"727","title":"Surface water supply of the United States, 1932, Part II, South Atlantic slope and eastern Gulf of Mexico basins","language":"ENGLISH","publisher":"U.S. Govt. Print. Off.,","doi":"10.3133/wsp727","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1934, Surface water supply of the United States, 1932, Part II, South Atlantic slope and eastern Gulf of Mexico basins: U.S. Geological Survey Water Supply Paper 727, vii, 221 p. ;23 cm., https://doi.org/10.3133/wsp727.","productDescription":"vii, 221 p. ;23 cm.","costCenters":[],"links":[{"id":137404,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wsp/0727/report-thumb.jpg"},{"id":25034,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wsp/0727/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4afee4b07f02db69786d","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":527443,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":22595,"text":"ofr6731 - 1934 - Ground-water supplies and irrigation in San Pedro Valley, Arizona","interactions":[],"lastModifiedDate":"2015-10-22T11:12:32","indexId":"ofr6731","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"67-31","title":"Ground-water supplies and irrigation in San Pedro Valley, Arizona","docAbstract":"The San Pedro Valley in southeastern Arizona extends from the International Boundary northward about 120 miles to the junction of the San Pedro River with the Gila River. The river basin also extends about 75 miles into Mexico. The valley varies in width from 5 to 20 miles, being widest in its middle portion, in the vicinity of Benson. The area of the portion of the basin within the United States in about 3,770 miles.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr6731","issn":"0094-9140","usgsCitation":"Bryan, K., Smith, G.E., and Waring, G., 1934, Ground-water supplies and irrigation in San Pedro Valley, Arizona: U.S. Geological Survey Open-File Report 67-31, 213 p., https://doi.org/10.3133/ofr6731.","productDescription":"213 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":155796,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr6731.jpg"},{"id":310410,"rank":1,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1967/0031/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Arizona","otherGeospatial":"San Pedro Valley","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -111.18713378906249,\n 31.348945815579977\n ],\n [\n -111.18713378906249,\n 33.293803558346596\n ],\n [\n -109.51171875,\n 33.293803558346596\n ],\n [\n -109.51171875,\n 31.348945815579977\n ],\n [\n -111.18713378906249,\n 31.348945815579977\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a96e4b07f02db65a5c1","contributors":{"authors":[{"text":"Bryan, Kirk","contributorId":37308,"corporation":false,"usgs":true,"family":"Bryan","given":"Kirk","email":"","affiliations":[],"preferred":false,"id":188535,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, G. E. P.","contributorId":63046,"corporation":false,"usgs":true,"family":"Smith","given":"G.","email":"","middleInitial":"E. P.","affiliations":[],"preferred":false,"id":188536,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Waring, Gerald A.","contributorId":88341,"corporation":false,"usgs":true,"family":"Waring","given":"Gerald A.","affiliations":[],"preferred":false,"id":188537,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":39334,"text":"pp185E - 1934 - Miocene plants from Idaho","interactions":[],"lastModifiedDate":"2013-01-31T11:21:50","indexId":"pp185E","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"185","chapter":"E","title":"Miocene plants from Idaho","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Shorter contributions to general geology, 1934-35","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"ENGLISH","doi":"10.3133/pp185E","usgsCitation":"Berry, E.W., 1934, Miocene plants from Idaho: U.S. Geological Survey Professional Paper 185, p. 97-125, https://doi.org/10.3133/pp185E.","productDescription":"p. 97-125","costCenters":[],"links":[{"id":169983,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/pp/0185e/report-thumb.jpg"},{"id":266806,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/0185e/report.pdf"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699c24","contributors":{"authors":[{"text":"Berry, E. W.","contributorId":82754,"corporation":false,"usgs":true,"family":"Berry","given":"E.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":221321,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":39335,"text":"pp185F - 1934 - A lower Lance florule from Harding County, South Dakota","interactions":[],"lastModifiedDate":"2012-02-02T00:10:17","indexId":"pp185F","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"185","chapter":"F","title":"A lower Lance florule from Harding County, South Dakota","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Shorter contributions to general geology, 1934-35","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"ENGLISH","doi":"10.3133/pp185F","usgsCitation":"Berry, E.W., 1934, A lower Lance florule from Harding County, South Dakota: U.S. Geological Survey Professional Paper 185, p. 127-133, https://doi.org/10.3133/pp185F.","productDescription":"p. 127-133","costCenters":[],"links":[{"id":122548,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/pp/0185f/report-thumb.jpg"},{"id":67078,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/0185f/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b23e4b07f02db6ae247","contributors":{"authors":[{"text":"Berry, E. W.","contributorId":82754,"corporation":false,"usgs":true,"family":"Berry","given":"E.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":221322,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":39332,"text":"pp185A - 1934 - Studies on the alkalinity of some silicate minerals","interactions":[],"lastModifiedDate":"2013-01-31T11:18:46","indexId":"pp185A","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"185","chapter":"A","title":"Studies on the alkalinity of some silicate minerals","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Shorter contributions to general geology, 1934-35","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"ENGLISH","doi":"10.3133/pp185A","usgsCitation":"Stevens, R., 1934, Studies on the alkalinity of some silicate minerals: U.S. Geological Survey Professional Paper 185, p. 1-13, https://doi.org/10.3133/pp185A.","productDescription":"p. 1-13","costCenters":[],"links":[{"id":169981,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/pp/0185a/report-thumb.jpg"},{"id":266802,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/0185a/report.pdf"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699d5c","contributors":{"authors":[{"text":"Stevens, R.E.","contributorId":62954,"corporation":false,"usgs":true,"family":"Stevens","given":"R.E.","email":"","affiliations":[],"preferred":false,"id":221319,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":1589,"text":"wsp737 - 1934 - Surface water supply of the United States, 1932 : Part 12. North Pacific slope basins : A. Pacific slope basins in Washington and upper Columbia River basin","interactions":[],"lastModifiedDate":"2012-02-02T00:05:13","indexId":"wsp737","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":341,"text":"Water Supply Paper","code":"WSP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"737","title":"Surface water supply of the United States, 1932 : Part 12. North Pacific slope basins : A. Pacific slope basins in Washington and upper Columbia River basin","language":"ENGLISH","publisher":"U.S. G.P.O.,","doi":"10.3133/wsp737","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1934, Surface water supply of the United States, 1932 : Part 12. North Pacific slope basins : A. Pacific slope basins in Washington and upper Columbia River basin: U.S. Geological Survey Water Supply Paper 737, vi, 184 p. :ill. ;23 cm., https://doi.org/10.3133/wsp737.","productDescription":"vi, 184 p. :ill. ;23 cm.","costCenters":[],"links":[{"id":137478,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wsp/0737/report-thumb.jpg"},{"id":26654,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wsp/0737/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4afbe4b07f02db69620a","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":527952,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":3351,"text":"cir6 - 1934 - Mineral-water supply of the Mineral Wells area, Texas","interactions":[],"lastModifiedDate":"2019-05-10T08:54:56","indexId":"cir6","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"6","title":"Mineral-water supply of the Mineral Wells area, Texas","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/cir6","usgsCitation":"Turner, S.F., 1934, Mineral-water supply of the Mineral Wells area, Texas: U.S. Geological Survey Circular 6, 15 p., https://doi.org/10.3133/cir6.","productDescription":"15 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"links":[{"id":363657,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/0006/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":139402,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/0006/report-thumb.jpg"}],"country":"United States","state":"Texas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -98.2781982421875,\n 32.675794797699766\n ],\n [\n -97.99598693847655,\n 32.675794797699766\n ],\n [\n -97.99598693847655,\n 32.88420028540548\n ],\n [\n -98.2781982421875,\n 32.88420028540548\n ],\n [\n -98.2781982421875,\n 32.675794797699766\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49e6e4b07f02db5e7473","contributors":{"authors":[{"text":"Turner, Samuel Foster","contributorId":26287,"corporation":false,"usgs":true,"family":"Turner","given":"Samuel","email":"","middleInitial":"Foster","affiliations":[],"preferred":false,"id":146705,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":45132,"text":"b857C - 1934 - The Curry district, Alaska","interactions":[{"subject":{"id":45132,"text":"b857C - 1934 - The Curry district, Alaska","indexId":"b857C","publicationYear":"1934","noYear":false,"chapter":"C","title":"The Curry district, Alaska"},"predicate":"IS_PART_OF","object":{"id":35875,"text":"b857 - 1934 - Mineral resources of Alaska: report on progress of investigations in 1932","indexId":"b857","publicationYear":"1934","noYear":false,"title":"Mineral resources of Alaska: report on progress of investigations in 1932"},"id":1}],"isPartOf":{"id":35875,"text":"b857 - 1934 - Mineral resources of Alaska: report on progress of investigations in 1932","indexId":"b857","publicationYear":"1934","noYear":false,"title":"Mineral resources of Alaska: report on progress of investigations in 1932"},"lastModifiedDate":"2021-08-17T20:48:14.952809","indexId":"b857C","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"857","chapter":"C","title":"The Curry district, Alaska","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/b857C","usgsCitation":"Tuck, R., 1934, The Curry district, Alaska: U.S. Geological Survey Bulletin 857, 42 p., https://doi.org/10.3133/b857C.","productDescription":"42 p.","startPage":"99","endPage":"140","costCenters":[],"links":[{"id":93862,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/0857c/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":168966,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/0857c/report-thumb.jpg"},{"id":388062,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_21030.htm"}],"country":"United States","state":"Alaska","otherGeospatial":"Curry district","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -151.0830,\n 62.5360\n ],\n [\n -150.5830,\n 62.5360\n ],\n [\n -150.5830,\n 63.0890\n ],\n [\n -151.0830,\n 63.0890\n ],\n [\n -151.0830,\n 62.5360\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b08e4b07f02db69b64e","contributors":{"authors":[{"text":"Tuck, Ralph","contributorId":107244,"corporation":false,"usgs":true,"family":"Tuck","given":"Ralph","email":"","affiliations":[],"preferred":false,"id":231167,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":34316,"text":"b851 - 1934 - The Book Cliffs coal field in Garfield and Mesa counties, Colorado","interactions":[],"lastModifiedDate":"2012-02-02T00:09:33","indexId":"b851","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"851","title":"The Book Cliffs coal field in Garfield and Mesa counties, Colorado","language":"ENGLISH","publisher":"U. S. Govt. print. off.,","doi":"10.3133/b851","usgsCitation":"Erdmann, C.E., 1934, The Book Cliffs coal field in Garfield and Mesa counties, Colorado: U.S. Geological Survey Bulletin 851, 150 p. :incl. illus., tables. 21 pl. (incl. fold. col. map (in pocket) fold. diagrs.) ;23 1/2 cm., https://doi.org/10.3133/b851.","productDescription":"150 p. :incl. illus., tables. 21 pl. (incl. fold. col. map (in pocket) fold. diagrs.) ;23 1/2 cm.","costCenters":[],"links":[{"id":92673,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/0851/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":92674,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/0851/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":167393,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/0851/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad3e4b07f02db68207d","contributors":{"authors":[{"text":"Erdmann, Charles Edgar","contributorId":16388,"corporation":false,"usgs":true,"family":"Erdmann","given":"Charles","email":"","middleInitial":"Edgar","affiliations":[],"preferred":false,"id":212776,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":39326,"text":"pp176 - 1934 - Geology and ore deposits of the Breckenridge mining district, Colorado","interactions":[],"lastModifiedDate":"2012-02-02T00:10:17","indexId":"pp176","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"176","title":"Geology and ore deposits of the Breckenridge mining district, Colorado","language":"ENGLISH","doi":"10.3133/pp176","usgsCitation":"Lovering, T.S., 1934, Geology and ore deposits of the Breckenridge mining district, Colorado: U.S. Geological Survey Professional Paper 176, 64 p., https://doi.org/10.3133/pp176.","productDescription":"64 p.","costCenters":[],"links":[{"id":113484,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/pp/0176/plate-02.pdf","size":"3481","linkFileType":{"id":1,"text":"pdf"}},{"id":113485,"rank":402,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/pp/0176/plate-05.pdf","size":"2905","linkFileType":{"id":1,"text":"pdf"}},{"id":113486,"rank":403,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/pp/0176/plate-13.pdf","size":"3551","linkFileType":{"id":1,"text":"pdf"}},{"id":113487,"rank":404,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/pp/0176/plate-15.pdf","size":"3748","linkFileType":{"id":1,"text":"pdf"}},{"id":113482,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/0176/report.pdf","size":"13221","linkFileType":{"id":1,"text":"pdf"}},{"id":113483,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/pp/0176/plate-01.pdf","size":"2412","linkFileType":{"id":1,"text":"pdf"}},{"id":169976,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/pp/0176/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad7e4b07f02db684551","contributors":{"authors":[{"text":"Lovering, T. S.","contributorId":108085,"corporation":false,"usgs":true,"family":"Lovering","given":"T.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":221310,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":3471,"text":"cir10 - 1934 - The McCoy mining district and gold veins in Horse Canyon, Lander County, Nevada","interactions":[],"lastModifiedDate":"2019-05-10T08:56:25","indexId":"cir10","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"10","title":"The McCoy mining district and gold veins in Horse Canyon, Lander County, Nevada","docAbstract":"The following geologic sketch is based on a two-day visit made to the McCoy district in September 1930. For valuable information and aid generously extended, the writer would express his thanks to the miners and prospectors of the district and especially to Mr. Joseph H. McCoy, a well-known mining man of Nevada and discoverer and founder of the district.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/cir10","usgsCitation":"Schrader, F.C., 1934, The McCoy mining district and gold veins in Horse Canyon, Lander County, Nevada: U.S. Geological Survey Circular 10, 13 p. , https://doi.org/10.3133/cir10.","productDescription":"13 p. ","numberOfPages":"19","costCenters":[],"links":[{"id":363658,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/0010/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":139387,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/0010/report-thumb.jpg"}],"country":"United States","state":"Nevada","county":"Lander County","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac8e4b07f02db67b989","contributors":{"authors":[{"text":"Schrader, Frank Charles","contributorId":77917,"corporation":false,"usgs":true,"family":"Schrader","given":"Frank","email":"","middleInitial":"Charles","affiliations":[],"preferred":false,"id":146988,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":35653,"text":"b854 - 1934 - Geology and ore deposits of the Casto quadrangle, Idaho","interactions":[],"lastModifiedDate":"2015-12-17T15:24:32","indexId":"b854","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"854","title":"Geology and ore deposits of the Casto quadrangle, Idaho","docAbstract":"The study of the Casto quadrangle was undertaken as the first item in a project to obtain more thorough knowledge of the general geology of southcentral Idaho on which to base study of the ore deposits of t he region. The quadrangle conta ins fragmentary exposures of Algonkian and Paleozoic sedimentary rocks, extensive deposits of old volcanic strata, presumably Permian, not heretofore recognized in this part of Idaho, and a thick succession of Oligocene(?) lava and pyroclastic rocks. The Idaho batholith and its satellites extend into the quadrangle, and in addition there a re large masses of Tertiary granitic rock, not previously distinguished in Idaho, and many Tertiary dikes, some of which are genetically associated with contact-metamorphic deposits. The area contains injection gneiss of complex origin, largely related to the Idaho batholith but in part resulting from injection by ~he Tertiary granitic rocks under relatively light load. Orogenic movement took place in Algonkian, Paleozoic, and Tertiary time. There is a summit peneplain or par tial peneplain of Tertiary, perhaps Pliocene age, and the erosional history since its elevation has been complex. The ore deposits include lodes and placers. The lodes are related to both the Idaho batholith and the Tert iary intrusive rocks and have yielded gold and copper ore of a total value of about 1,000,000. Placers, largely formed in an interglacial inter val, have yielded about an equal amount. There has been some prospecting but almost no production since 1916.
","language":"English","publisher":"U.S. Government Printing Office","doi":"10.3133/b854","usgsCitation":"Ross, C.P., 1934, Geology and ore deposits of the Casto quadrangle, Idaho: U.S. Geological Survey Bulletin 854, Report: 135 p.; 1 Plate: 18.48 x 27.70 inches, https://doi.org/10.3133/b854.","productDescription":"Report: 135 p.; 1 Plate: 18.48 x 27.70 inches","numberOfPages":"149","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":167466,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/b854.jpg"},{"id":109521,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_21026.htm","linkFileType":{"id":5,"text":"html"},"description":"21026"},{"id":312483,"rank":701,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/0854/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":312484,"rank":702,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/0854/plate-1.pdf","text":"Plate 1","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Idaho","otherGeospatial":"Challis National Forest, Salmon National Forest","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -117.16918945312499,\n 43.16512263158296\n ],\n [\n -117.16918945312499,\n 46.604167162931844\n ],\n [\n -112.91748046874999,\n 46.604167162931844\n ],\n [\n -112.91748046874999,\n 43.16512263158296\n ],\n [\n -117.16918945312499,\n 43.16512263158296\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad7e4b07f02db68464d","contributors":{"authors":[{"text":"Ross, Clyde P.","contributorId":10473,"corporation":false,"usgs":true,"family":"Ross","given":"Clyde","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":215010,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":34922,"text":"b848 - 1934 - The microscopic determination of the nonopaque minerals","interactions":[],"lastModifiedDate":"2012-02-02T00:09:30","indexId":"b848","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","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":"848","title":"The microscopic determination of the nonopaque minerals","language":"ENGLISH","publisher":"U.S. Govt. print. off.,","doi":"10.3133/b848","usgsCitation":"Larsen, E.S., and Berman, H., 1934, The microscopic determination of the nonopaque minerals (2nd ed.): U.S. Geological Survey Bulletin 848, 266 p. :incl. tables., diagrs. ;23 cm., https://doi.org/10.3133/b848.","productDescription":"266 p. :incl. tables., diagrs. ;23 cm.","costCenters":[],"links":[{"id":92988,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/0848/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":166512,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/0848/report-thumb.jpg"}],"edition":"2nd ed.","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b32e4b07f02db6b494f","contributors":{"authors":[{"text":"Larsen, Esper S. Jr.","contributorId":39029,"corporation":false,"usgs":true,"family":"Larsen","given":"Esper","suffix":"Jr.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":213814,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Berman, Harry","contributorId":45371,"corporation":false,"usgs":true,"family":"Berman","given":"Harry","email":"","affiliations":[],"preferred":false,"id":213815,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":1340,"text":"wsp660 - 1934 - Artesian water in Somervell County, Texas","interactions":[],"lastModifiedDate":"2016-08-22T10:08:31","indexId":"wsp660","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1934","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":341,"text":"Water Supply Paper","code":"WSP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"660","title":"Artesian water in Somervell County, Texas","docAbstract":"Somervell County is part of the Grand Prairie region of north-central Texas. An excellent supply of artesian water is available from the Trinity reservoir at no great depth. The first flowing well in Somervell County was drilled in 1880, and the first flowing well in Glen Rose, the county seat, was drilled in 1881. Since 1880 more than 500 wells have been constructed, probably more than half of them prior to 1900. Many of these early wells have been abandoned, either because the well hole caved in as a result of the absence or deterioration of casing or because the wells ceased to yield water by natural flow. The artesian water has always been used chiefly for domestic supply and for watering stock. Only a comparatively small area of farm land is now irrigated. The quantity used to supply the needs of tourist camps and outdoor swimming pools forms a relatively large percentage of the total amount withdrawn from the artesian reservoir in Somervell County. The artesian water is contained chiefly in the permeable sandstone beds--the basal sands for the Trinity group. Some shallow wells of small capacity are supplied by water in the crevices and solution channels in limestone that apparently is near the base of the Glen Rose formation and probably derives its water by leakage from the underlying Trinity reservoir. The wells encounter from one to three aquifers, the number depending upon their depth and location. At and around Glen Rose, the area in which most of the flowing wells are concentrated, the first aquifer is the creviced portion of the limestone, which is encountered at about 50 feet but does not everywhere yield water. The second and third aquifers, both of which are part of the 'basal sands' of the Trinity group, are much more uniform and persistent; the second is encountered at Glen Rose at depths of 100 to 135 feet, and the third at depths of about 275 to 330 feet. The artesian reservoir is supplied by water that falls as rain or snow upon the outcrop of the 'basal sands' on the higher lands west and north of Somervell County. These permeable beds dip eastward and southeastward beneath the county and are covered by the less permeable beds of the overlying Glen Rose formation. As the water that reaches the zone of saturation percolates down the dip of the beds it is confined under artesian pressure, and wells that penetrate these beds at lower altitudes yield water by natural flow. Originally the artesian pressure was sufficient to raise the water in tightly cased wells in the northwestern part of Somervell County to a maximum altitude of about 750 feet above sea level, but at Glen Rose the original artesian head was probably not more than 710 feet. From the information avail- able it would appear that the original head of the water in the upper aquifers was not nearly as great as that of the lower aquifer. The head has declined generally throughout the county. At Glen Rose in June 1930 the artesian head of the water from the deepest aquifer of the Trinity reservoir was about 639 feet above sea level, and the head of the water from the upper aquifers was about 15 feet less. The decline in head still continues, but at a very much slower rate than formerly. With the decline in head the size of the area of artesian flow has decreased, though in recent years the shrinkage has been comparatively little. The draft from the artesian reservoir in Somervell County during the summer is estimated at about 1,000,000 gallons a day, distributed as follows: Domestic use, 150,000 gallons; stock use, 60,000 gallons; recreation pools, 250,000 gallons; irrigation, 180,000 gallons; and waste, not including underground leakage, 360,000 gallons. In winter the daily draft is probably about 370,000 gallons less than in summer. The 360,000 gallons a day permitted to flow from wells without being used for any beneficial purposes is an unnecessary drain upon the artesian reservoir. The head of many of the flowing wells in Glen R
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