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Results for “Petrology”

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USGS1896

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for 1892 and 1893

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USGS1970

Precambrian melasyenite of Ute Creek, San Juan Mountains, Colorado — Chemistry, petrology, and strontium isotopes

No abstract available.

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USGS1896

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for the year 1894

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USGS1896

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for the year 1895

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USGS1980

Stratigraphy, preliminary petrology, and some structural features of Tertiary volcanic rocks in the Gabbs Valley and Gillis ranges, Mineral County, Nevada

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USGS1897

Bibliography and index of North American geology, paleontology, petrology, and mineralogy, for the year 1896

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USGS1981

Stratigraphy of the Chattanooga Shale (Upper Devonian and Lower Mississippian) in vicinity of Big Stone Gap, Wise County, Virginia, with a section on petrology

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USGS1898

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for the year 1897

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USGS1899

Bibliography and index of North American geology, paleontology, petrology, and mineralogy, for the year 1898

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USGS1986

Petrology of metamorphosed chromite-bearing ultramafic rocks from the Red Lodge District, Montana

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USGS1990

Petrology of the noritic and gabbronoritic rocks below the J-M Reef in the Mountain View area, Stillwater Complex, Montana

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USGS1990

Petrology of chromite-bearing rocks from the lowermost cyclic units in the Stillwater Complex, Montana

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USGS1900

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for the year 1899

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USGS1987

Petrology and sedimentology of the Horlick Formation (Lower Devonian), Ohio Range, Transantarctic Mountains

The Horlick Formation of Early Devonian age is as thick as 50 m and consists of subhorizontal, interbedded subarkosic sandstone and chloritic shale and mudstone. The Horlick overlies an erosion surface cut into Ordovician granitic rocks and is, in turn, overlain by Carboniferous and Permian glacial and periglacial deposits. Textures, sedimentary structures, and ubiquitous marine body fossils and animal traces suggest that the Horlick was deposited on a shallow shelf having moderate wave energy and a moderate tidal range. The source terrane probably lay to the north, and longshore transport was toward the west.

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USGS1989