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Publication Extents

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Ground-water levels in observation wells in Oklahoma, 1965-66
D.L. Hart Jr.
1967, Open-File Report 67-285
The investigation of the ground-water resources of Oklahoma by the U.S. Geological Survey in cooperation with the Oklahoma Water Resources Board includes a continuing program to collect records of water levels in selected observation wells on a systematic basis. These water-level records: (1) provide an index to available ground-water supplies;...
Geophysical ore guides along the Colorado mineral belt
James E. Case
1967, Open-File Report 67-39
A 40-50-mgal gravity low trends northeast along the Colorado mineral belt between Monarch Pass and Breckenridge, Colorado. The low is probably caused by a silicic Tertiary batholith of lower density than adjacent Precambrian crystalline rocks. Many major mining districts associated with silicic Tertiary intrusives are near the axis of the...