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Status of Correlation of Quaternary Stratigraphic Units in the Western Conterminous United States1

Published online by Cambridge University Press:  20 January 2017

Peter W. Birkeland ,
Dwight R. Crandell  and
Gerald M. Richmond
Peter W. Birkeland
Affiliation:
Department of Geology, University of Colorado, Boulder, Colorado, USA
Dwight R. Crandell
Affiliation:
U.S. Geological Survey, Denver, Colorado
Gerald M. Richmond
Affiliation:
U.S. Geological Survey, Denver, Colorado
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Abstract

Deposits of Quaternary age from the Rocky Mountains to the Pacific Coast in the western conterminous United States represent a great variety of environments. The deposits include those of continental and alpine glaciers, glacial meltwater streams, nonglacial streams, pluvial lakes, marine environments, eolian environments, and masswasting environments. On two charts we have attempted to correlate representative sequences of deposits of many of these environments, based on published sources and recent unpublished investigations. Evidence for correlation is based mainly on stratigraphic sequence, soil characteristics, the amount of subsequent erosion and interlayered volcanic ash beds identifiable as to source. Chronologic control is based on numerous radiocarbon dates, U-series dates on marine fossils, and K-Ar dates on volcanic rocks. The Bishop volcanic ash bed and one of the Pearlette-like volcanic ash beds appear to represent significant regional key horizons, respectively about 700,000 and 600,000 years old. Rock magnetism is shown to suggest the paleomagnetic polarity at the time of rock deposition. Assigned land-mammal ages of included fossils help to put limits on the age of some units.

Type
Original Articles
Information
Quaternary Research , Volume 1 , Issue 2 , April 1971 , pp. 208 - 227
Copyright
University of Washington

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Footnotes

1

Publication authorized by the Director, U.S. Geological Survey.

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