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© 2013 The Geological Society of America, Inc.
All rights reserved.

All materials subject to this copyright and included in this volume may be photo-
copied for the nonc­ ommercial purpose of scientific or educational advancement.

Published by the Geological Society of America, Inc.
3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA

Printed in the USA.

Revised and updated in 2013 by the Geological Society of America.

Book design by Heather L. Sutphin.
Photography by Chris Brown, Eric Christensen, and Heather L. Sutphin unless
otherwise stated.

GSA gratefully acknowledges the earlier work of Barb EchoHawk in the cata-
loging and written descriptions of GSA’s specimen collection.The Society also
acknowledges Prof. James S. Aber, of the Earth Science Department of Emporia
State University, for information about Richard A.F. Penrose Jr. from Aber’s web-
site, http://academic.emporia.edu/aberjame/histgeol/penrose/penrose.htm.