This link has been bookmarked by 22 people . It was first bookmarked on 31 May 2007, by Laura Cummings.
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David GovoniThe Tapestry of Time and Terrain is produced from a geologic map and a shaded relief image. This digital combination reveals the geologic history of the conterminous United States through the interrelation of rock type, topography and time. Regional surfa
USGS geology USA geography maps topography digital visualization geologic-maps
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