U.S. DEPARTMENT OF THE INTERIOR
BRUCE BABBITT, Secretary

U.S. GEOLOGICAL SURVEY
MARK SCHAEFER, Interim Director

Printed version free on application to the U.S. Geological Survey
Information Services, Box 25286, Federal Center, Denver, CO 80225

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

Published in the Eastern Region, Reston, Va.
Manuscript approved for publication September 2, 1997.

Library of Congress Cataloging in Publication Data

Forum on Geologic Mapping Applications in the Washington-Baltimore Urban Area (1997 : Reston, Va.)

Forum on Geologic Mapping Applications in the Washington-Baltimore Urban Area : proceedings, Reston, Virginia, April 23, 1997 / edited by J. Wright Horton and Emery T. Cleaves.

p. cm. -- (U.S. Geological Survey circular ; 1148)

"Sponsored by the U.S. Geological Survey and the Maryland Geological Survey."

Includes bibliographical references.

1. Geological mapping--Washington (D.C.) Region --Congresses. 2. Geological mapping--Maryland--Baltimore Region--Congresses. I. Horton, J. Wright.
II. Cleaves, Emery T. III. Geological Survey (U.S.) IV. Maryland Geological Survey.
V. Title. VI. Series.

QE36.F615 1997

97-38788

557.5'022'3--dc21

CIP

COVER
Background.--Image from the geologic map of the Washington West quadrangle, District of Columbia, Montgomery County and Prince Georges Counties, Maryland, and Arlington and Fairfax Counties, Virginia, by A.H. Fleming and others (1994, U.S. Geological Survey Map GQ-1748, scale 1:24,000).

Inset.--Areas of 30-degree x 60-degree quadrangle geologic mapping in relation to stages of urban growth from the year 1900 (green) to 1953 (orange) and 1992 (red), adapted from urban growth maps produced by the U.S. Geological Survey Mapping Applications Center in cooperation with the University of Maryland Baltimore County, the U.S. Bureau of Census, and others. Further information is available on the World Wide Web at

http://edcwww.cr.usgs.gov/umap/umap.html

Computer graphics by Stephen Schindler and Lendell Keaton.

This on-line edition contains all text from the original book in its entirety. Some figures have been modified to enhance legibility at screen resolutions.

The printed version of this publication is one of a series of circulars prepared by the U.S. Geological Survey. To obtain a catalog of additional titles in this series, contact:

USGS Information Services
Box 25286, Building 810
Denver Federal Center
Denver, CO 80225
303-202-4700; Fax 303-202-4693

As the Nation's principal conservation agency, the Department of the Interior has responsibility for most of our nationally owned public lands and natural and cultural resources. This includes fostering sound use of our land and water resources; protecting our fish, wildlife, and biological diversity;preserving the environmental and cultural values of our national parks and historical places; and providing for the enjoyment of life through outdoor recreation. The Department assesses our energy and mineral resources and works to ensure that their development is in the best interests of all our people by encouraging stewardship and citizen participation in their care. The Department also has a major responsibility for American Indian reservation communities and for people who live in Island Territories under U.S. Administration.

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