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The Barstow Formation of Miocene age consists chiefly of lacustrine and fluviatile clastic rocks. Lacustrine rocks are mainly mudstone with interbedded tuff and carbonate rocks. The tuffs make up about 1-2 percent of the stratigraphic section and are the most conspicuous and continuous strata. Most tuff layers are less than 1 foot thick, but some are as much as 7 feet thick. All tuffs were originally silicic, and most were vitric and fine to very fine grained. This report summarizes the physical properties, chemistry^ and genesis of those silicate minerals that formed in the tuffs during diagenesis.
Sheppard et al. (Wed,) studied this question.
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