Map shows content and origins of US geologic basement

Map shows content and origins of US geologic basement
Boulder CO (SPX) Apr 28, 2015 - A map showing the many different pieces of Earth's crust that comprise the nation's geologic basement is now available from the U.S. Geological Survey. This is the first map to portray these pieces, from the most ancient to recent, by the events that influenced their composition, starting with their origin. This product provides a picture of the basement for the U.S., including Alaska, tha ... morehttp://www.spacedaily.com/reports/Map_shows_content_and_origins_of_US_geologic_basement_999.html