Paleonet: Polished clam identification?
proopnarine at calacademy.org
Sun Nov 14 02:57:37 GMT 2010
On 11/13/2010 05:41 PM, Mark Storaasli wrote:
> You can't count on "supposed provenance" -all clams I see look pretty
> how far back does each genus appear in the fossil record? I think
> these are
> doubtfully any older than Cretaceous; more likely younger.
There's no reason to doubt the age assignment of Jurassic, particularly
given that specimens might be obtained from the same localities in
Madagascar as the echinoid /Pygurus/. It does indeed look veneroid
Paula. Maybe you need to find a collection from Sakahara and see if
there are unpolished specimens available. NMNH maybe? I don't think that
we have any, but I'll check.
Peter D. Roopnarine, Ph.D., Curator of Geology
Dept. of Invertebrate Zoology& Geology
California Academy of Sciences
55 Music Concourse Drive
Golden Gate Park
San Francisco CA 94118
"The progress of science is...transformation of the qualitative into the quantitative." Atkins.
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