Paleonet: Polished clam identification?

Mark Storaasli mstoraasli at gmail.com
Sun Nov 14 01:41:20 GMT 2010


You can't count on "supposed provenance"  -all clams I see look pretty
modern-
how far back does each genus appear in the fossil record? I think these are
doubtfully any older than Cretaceous; more likely younger.

~Mark (not expert, but opinionated?)

On Sat, Nov 13, 2010 at 5:15 PM, Paula M Mikkelsen <pmm37 at cornell.edu>wrote:

> Dear Paleonetters -
> I am seeking help in identifying a polished Jurassic bivalve that seems to
> be for sale everywhere, but is never fully identified. I purchased several
> specimens at the GSA exhibition in Denver last week. They were simply
> labelled "Paleozoic, Madagascar." On the web, I find them attributed to
> Sakaraha, Majunga Basin, and Morondava Basin, all in Madagascar; and
> Mesozoic rather than Paleozoic. I have seen only two with taxonomic names -
> * Mercenaria *sp. (which seems unlikely) and "*Trigonia *Mussel Family"
> (which also seems unlikely given the sculpture that remains). All of them
> seem to be ca. 3 inches long, orange to white, double valved, with solid
> infill. There is a distinct lunule and escutcheon - looks veneroid. Can
> anyone identify this apparently common but mysterious clam, or point me in
> the right direction in the literature?
>
> See images of the clam at http://www.stonesbones.com/kui5.htm (scroll down
> to polished fossilized clam) and
> http://www.mrwoodsfossils.co.uk/product.php?prod=272.
>
> Signed,
> Baffled at PRI
>
> ********************************************
> Paula M. Mikkelsen, Ph.D.
> Associate Director for Science
> and Director of Publications
> Paleontological Research Institution
> 1259 Trumansburg Road
> Ithaca, NY 14850
> Tel. (607) 273-6623, ext. 20
> Fax (607) 273-6620
> email  pmm37 at cornell.edu
>
> "No passion in the world is equal to the passion to alter someone else's
> draft."  -H. G. Wells
>
> See "Seashells of Southern Florida: Living Marine Mollusks of the Florida
> Keys and Adjacent Regions: Bivalves<http://press.princeton.edu/titles/8484.html>"
> and BivAToL - Assembling the Bivalve tree of Life <http://bivatol.org>.
>
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> and Maxie's Supper Club.
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