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January 1, 1934

Geology of the North and South McCallum anticlines, Jackson County, Colorado, with special reference to petroleum and carbon dioxide

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 Creta

Authors

John Charles Miller

January 1, 1934

Gold-quartz veins south of Libby, Montana

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

Authors

Russell Gibson

January 1, 1934

Ground-water supplies and irrigation in San Pedro Valley, Arizona

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 Stat

Authors

Kirk Bryan, G. E. P. Smith, Gerald A. Waring

January 1, 1934