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1. Boundaries and Tags for Major Geologic Units in the United States [UTC_majorgeologicunits]
This data set contains boundaries and tags for major geologic units in the conterminous United States. In addition to the polygons representing the areal extent of geologic units, it identifies boundaries ...

2. USGS Geologic Map of North America [USGS_GMNA]
The Geologic Map of North America (published February 2005) portrays the grand architecture of the continent as we understood it in the closing years of the 20th century. As the final ...

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