Excerpt from The District of Columbia, Its Rocks and Their Geologic History In Pleistocene time, when the glaciers on the northern part of the continent were me

Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume 208. Rock Creek Park is a special place for studying geology. Fo

"This guide's 14 chapters, which span the Rocky Mountain region's 1.7-billion-year history, give a retrospective glimpse of early geologic ideas being forged, b