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Year Published: 1968

Isotopic age of the Nevadan Orogeny and older Plutonic and metamorphic events in the Klamath Mountains, California

Several metamorphic and plutonic events have been recognized in the Klamath Mountains utilizing potassium-argon and rubidium-strontium mineral and whole-rock ages. The oldest known metamorphic event in the region produced the Abrams Mica Schist and the co-extensive Salmon Hornblende Schist. Strontium evolution diagrams indicate that the age of...

Lanphere, Marvin A.; Irwin, William P.; Hotz, Preston E.

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Year Published: 1968

Shatter cones at Sierra Madera, Texas

Shatter cones abound in the central uplift of Sierra Madera and they occur as far as 6.5 kilometers from the center. Apical angles average near 90 degrees. Whole cones and full cones represented by diversely oriented cone segments in any structural block show relatively uniform orientations of axes and a dominant direction of point. The cones...

Howard, Keith A.; Offield, Terry W.

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Year Published: 1967

Chapter C in Geological Survey research 1967

Low-grade metamorphic rocks of the blueschist facies grade upward to the sole of a great thrust fault along the eastern margin of the Coast Ranges in northern California and southwestern Oregon. The gradation is defined by three textural zones of increasing reconstitution in metagraywacke, and by two metamorphic mineral zones, lawsonite and...

Geological Survey research 1967, Chapter C; 1967; PP; 575-C; USGS NUMBERED SERIES; Geological Survey research 1967; Geological Survey (U.S.)

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Year Published: 1967

Historic surface faulting in continental United States and adjacent parts of Mexico

This report summarizes geometric aspects of approximately 35 instances of historic faulting of the ground surface in the continental United States and adjacent parts of Mexico. This information is of immediate importance in the selection and evaluation of sites for vital structures such as nuclear power plants. The data are presented in a table...

Bonilla, M.G.
Historic surface faulting in continental United States and adjacent parts of Mexico; 1967; OFR; 67-23; Bonilla, M. G.

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Year Published: 1967

Devonian rocks of the Yukon-Porcupine Rivers area and their tectonic relation to other Devonian sequences in Alaska

Devonian rocks along the Yukon River near the Alaska-Yukon boundary comprise 250 feet of limestone and shale and 800 feet of chert and siliceous shale, all referred to the McCann Hill Chert of Early to Late Devonian age; about 3,000 feet of non-marine chert-pebble conglomerate, graywacke, and shale of the Nation River Formation (Late Devonian);...

Churkin, Michael; Brabb, Earl E.

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Year Published: 1965

Geological Survey research 1965, Chapter D

Scientific notes and summaries of investigations by members of the Conservation, Geologic, and Water Resources Divisions tn geology, hydrology, and related fields.

Geological Survey research 1965, Chapter D; 1965; PP; 525-D; Geological Survey research 1965 (Professional Paper 525); U.S. Geological Survey

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Year Published: 1965

Preliminary geologic map of the Eagle D-1 quadrangle, east-central Alaska

Brabb, Earl E.; Churkin, Michael
Preliminary geologic map of the Eagle D-1 quadrangle, east-central Alaska; 1965; OFR; 65-20; Brabb, Earl E.; Churkin, Michael