Abstract
In this paper the attempt is made to describe a particular section of organic siliceous shale in as nearly objective fashion as possible, and to interpret the facts without reference to any hypothesis about the origin of the "Monterey shale" formations. The samples selected for study turn out to be very different from "typical diatomaceous shale," and to contain a varied and interesting assemblage of detrital and secondary minerals, and especially of micro-organisms. Its constituents suggest that the material may have accumulated in a fairly open sea, not many miles from land, in water from a few hundred feet to a few hundred fathoms deep. However different these rocks may be from more "typical" organic shales, there is some evidence that they may have been concerned in the genesis of southern California oil.
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