print email comment close A Tapestry of Time and Terrain: The Union of Two Maps - Geology and Topography URL: http://tapestry.usgs.gov/default.html Description: Information about the topography and geology of the continental United States. A digital map contains the description for each geologic feature with information for the eras in which it was formed. "Rock of Ages" is a timeline of each geologic era linked to the regions of the map. "Boundaries" shows two more maps: one with geomorphic, or physiographic, regions; the other with state boundaries. From the U.S. Geological Survey (USGS). Publisher: U.S. Geological Survey Library of Congress Subject Headings: Geology -- United States -- Maps United States -- Maps, Topographic LII Database Information: Record 14269 created by Dana Lubow on 06/28/2000 Last modification on 08/23/2005 Published: 06/28/2000   Funding agency: California State Library LII Item ID: http://lii.org/cs/lii/view/item/14269