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Generalized Geologic Map of the Conterminous United States
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  The North American Tapestry of Time and Terrain

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Llano Uplift

  Close-up of
 Llano Uplift

The blue and orange patches in central Texas indicate the Llano Uplift. This structural high provides a window into the underlying Precambrian rocks that formed a margin of the ancient supercontinent of Rodinia. These 1.0-1.3 billion-year-old metamorphic rocks belong to a long, now poorly exposed, mountain belt that once included parts of modern Scandinavia and Antarctica. Similar rocks can be found in New York's Adirondack Mountains.