Tufaceous sandstone |
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This is a sample of tuffaceous standstone. It consists dominantly of rhyolitic tephra (ashfall) and quart sand, and contains scattered dark rock fragments. This sample came from stratified late Tertiary-age alluvial/playa deposits in a volcanic region in the Cady Mountains, Mojave Desert, CA. |
Tufaceous sandstone| https://gotbooks.miracosta.edu/rocks/sedimentary/50.html | 2/2/2021 |