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U.S. Department of Energy
Office of Scientific and Technical Information

Map of the tuff aquitard (lower tuff units) in Yucca Flat, Nevada Test Site

Technical Report ·
OSTI ID:6288173

The tuff units of Yucca Flat, Tertiary in age, have been divided into an upper aquifer and a lower aquitard. The tuff aquitard comprises all the tuffs and associated sedimentary rocks older than the Paintbrush Tuff. The aquitard formations consist of nonwelded to densely welded ash-flow tuff, ash-fall tuff, and reworked ash-fall and tuffaceous sandstone, siltstone, and claystone. One common feature among these formations is matrices consisting of zeolite or clay minerals. The tuff aquitard overlies two carbonate aquifers and two clastic aquitards of Precambrian and Paleozoic ages.

Research Organization:
Geological Survey, Denver, CO (USA)
DOE Contract Number:
EY-76-A-08-0474
OSTI ID:
6288173
Report Number(s):
USGS-474-262; NTS-263
Country of Publication:
United States
Language:
English