The approximately 21,000 feet of Lower Cambrian and Precambrian strata exposed in the White Mountains and Inyo Mountains, California, and vicinity is divided into eight formations. The upper four are new and constitute essentially what heretofore has been called the Silver Peak group, a term herein abandoned. The upper 12,000 feet of the succession, lying above a significant regional unconformity, consists of a conformable sequence within which occurs the zone bearing the oldest trilobite faunas; olenellid trilobites range through approximately 6700 feet of strata.

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