Skydiver
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The locality you're referring to likely lies up by Cedar Flat near Westgard Pass, east of Big Pine, California. That entire area contains impressive accumulations of the Lower Cambrian Poleta Formation, from whose carbonate intervals lowest in the stratigraphic section abundant archeocyathids occur in primitive reef form (some paleontologists, though, reject the idea that archeocyathids formed true reefs, as we understand them today) .The fine-grained, greenish-brown, slightly metamorphosed shales that lie just above the contact with this archeocyathid limestone sometimes bear small trilobites and helioplacoid echinoderm debris, but specimens are no longer plentiful due to the fact that the Cedar Flat region has been used for decades by various universities as a base camp for their Summer Field studies; students and professors usually find most of the goodies here. The definitive reference to obtain is USGS Map GQ-529, by C.A Nelson, (1966) Geologic Map of the Blanco Mountain Quadrangle, Inyo and Mono Counties, California. One important point to remember, though, is that the fossiliferous area lies within the Inyo National Forest, administered by the U.S. Forest Service. You may need to secure a special use permit from their field office in either Big Pine or Bishop before visiting the fossil-bearing outcrops.
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