Hi Fabio,
It does look like there's a predominance of one species, perhaps a
Meretrix species. The single valve being held up is rounded and has a
straight hinge area--Glycymeris? In the photo of the multiple mollusks
(without the women), there looks to be an Arca, with radial ribs.
It must have stunk there, no?
David Kirsh
Durham, NC
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