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Sands of the Palm Spring Formation are similar to those of the Colorado delta and those deposited in Lake Mead. All are very well sorted, and have similar median diameters and mineral composition. Cretaceous Foraminifera (reworked) which are widespread in the Palm Spring occur in the delta sands. Various primary structures characteristic of the Palm Spring are present in delta sediments. Both groups of sediments contain important amounts of volcanic and carbonate rock fragments and potash feldspar whereas plagioclase, hornblende, and augite are minor. The source indicated by this assemblage is the Great Basin-Colorado Plateau area rather than the Peninsular Range. The latter area probably supplied some coarse arkosic sands and gravels interfingering in the west with the fine sands, si ts, and clays but it is probable that most of the Palm Spring Formation is Pleistocene delta sediment.
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