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The Belt series in Montana, with a geologic map and a section on paleontologic criteria
Clyde Polhemus Ross, B.A.L. Skipp, Richard Rezak
1963, Professional Paper 346
Problems related to the Belt series have been discussed for nearly a hundred years, but the amount of detailed mapping and other quantitative data available, even now, is not commensurate with the importance of the problem.  The present paper is an attempt to summarize existing data in the light of...
Niobium and tantalum in the United States, exclusive of Alaska and Hawaii
Raymond Laurence Parker
1963, Mineral Investigations Resource Map 36
The accompanying map shows the location of the principal known deposits of niobium and tantalum minerals in the United States, exclusive of Alaska and Hawaii. Symbols of different shapes are used to depict deposits of different geologic types, and large symbols denote deposits with a record of production. Small symbols...
Fluid impact craters and hypervelocity - high velocity impact experiments in metals and rocks
H. J. Moore, R.W. MacCormick, D. E. Gault
1963, Open-File Report 63-100
The impact phenomena of hypervelocity and high-velocity projectiles with rock and metal targets are being studied in a cooperative research program conducted by the U.S. Geological Survey and the Ames Research Center of the National Aeronautics and Space Administration. This paper deals with the comparison of: (1) fluid-impact craters produced...