U.S. Department of the Interior
Gale A. Norton, Secretary

U.S. Geological Survey
Charles G. Groat, Director

U.S. Geological Survey, Reston, Virginia: 2004

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Manuscript approved for publication January 5, 2004.
Prepared by Eastern Region Publications, Geologic Discipline, USGS.
Edited by James Estabrook and Katharine Schindler.
Graphics by Lendell Keaton and Paul Mathieux.
Photocomposition and design by Elizabeth Koozmin.
Online version by Kathie Rankin.

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not
imply endorsement by the U.S. Government.

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