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Figure 1-8. Simplified Geologic Map Showing the Location of Yucca Mountain in Relation to the Southwestern Nevada Volcanic Field

This figure is a graphical representation of concepts described in the surrounding text in this section.
The map shows the location of (1) pre-Tertiary basement rocks (mostly Paleozoic sedimentary rocks ranging from 225 to 570 million years in age); (2) Tertiary volcanic rocks of Miocene age (i.e., 15 to 7.5 million years old) deposited during very large, caldera-forming eruptions; (3) Tertiary and Quaternary basaltic rocks of the southwestern Nevada volcanic field formed during much smaller volcanic eruptions, with ages ranging from more than 5 million years to about 77,000 years; and (4) Quaternary deposits of alluvium and other sedimentary deposits less than 2 million years old. Source: modified from Sawyer et al. 1994; Stewart 1997.

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