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>The shells in the larger rock are Turritella sp. For some reason,
>Turritella shells are often fossilized in huge masses, and the hard
> rock containing such masses are often referred to as "turritella
> agate".
Actually, standard "Turritella agate" contains Eocene Juga spp.,
freshwater pleurocerids from the Green River Formation in Colorado and
Wyoming. "Turritella" is a misnomer in that case.
However, the present specimens come from not far from the modern
California coast and probably represent actual turritellids. There's a
fair amount of research that has been done on the fossils of the
general region. The California Geological Survey website would
probably be a good source of information, or a geology department at a
nearby college.
----------------------------------------
Dr. David Campbell
425 Scientific Collections
University of Alabama, Box 870345
Tuscaloosa AL 35487
"James gave the huffle of a snail in
danger But no one heard him at all" A.
A. Milne
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