In the July number of the Bulletin two writers discuss the Sespe formation and infer from its mineralogy that it was deposited during a period of aridity or semiaridity. Mr. Reinhart 1 writes:
“The climate that existed at the time of deposition is suggested by the undecomposed condition of the feldspars and other chemically susceptible minerals, and by the red color of the sediments. From these facts it is inferred that the climate probably was warm and semiarid.”
Mr. Gianella 2 comes to a similar conclusion, though his study deals chiefly with the heavy minerals rather than with the feldspars:...
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