U.S. Geological Survey Open-File Report 97-540
Online version 1.0
By Molly G. Groome, Christina E. Gutmacher, and Andrew J. Stevenson
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This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. government.