The Lost Burro Gap Fossil Locality, California

A desert adventurer--my late father--stands on the west side of Lost Burro Gap at the exact contact between two Paleozoic Era geological periods. The brownish outcrop at lower right lies at the very top of the Middle to Upper Devonian Lost Burro Formation; it is therefore very latest Devonian in geologic age. Behind my father, everything within view lies in the Lower Mississippian Tin Mountain Limestone. Geologic age of the precise point where my father stands is 358.9 million years--transitional Devonian to Mississippian age.

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