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Page 5679, results 141951 - 141975

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Publication Extents

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The Shawangunk Formation (Upper Ordovician(?) to Middle Silurian) in eastern Pennsylvania
Jack Burton Epstein, Anita G. Epstein
1972, Professional Paper 744
The Shawangunk Formation of Early and Middle Silurian age, and possibly Late Ordovician age, in eastern Pennsylvania and northwestern New Jersey forms a thick clastic wedge of sediments derived from sourcelands to the southeast uplifted during the Taconic orogeny. The formation is divided into four newly denned members, from bottom...
Cenozoic rocks of the Santa Rita Mountains, southeast of Tucson, Arizona
Harald Drewes
1972, Professional Paper 746
The Santa Rita Mountains of southeastern Arizona are underlain, in part, by volcanic and sedimentary rocks and by many small intrusives, of Cenozoic age. These rocks provide a more complete geologic record than that of other ranges in the region, and consequently the Santa Rita Mountains are a useful reference...
Sampling of copper-bearing Keweenawan rocks of northwestern Wisconsin
Carl E. Dutton
1972, Open-File Report 72-98
Metallic copper or copper minerals are locally present, in flows, conglomerate, siltstone, and shale of Keweenawan age that underlie about 3,000 square miles of northwestern Wisconsin. Representative samples taken from 24 of the reported occurrences in lava or conglomerate contain 0.0075 to 0.69 percent copper; 10 of them have more...