Ancient fossil

Inspired by the theme, as we dug up the dinosaur
The general gist is this: the husband familiar unloaded on the gravel and came across a fossilized shell of a mollusk. The shell about 30 cm long, heavy, and feels like an ordinary stone. The flaps slightly open. View more did not dare because afraid to break.
We can assume that this is some of the existing marine bivalves. But not all the same rubble into the sea produces, and in open pits. About age shells or anything I can not assume, and paleontologists in our area is not likely.
What are the assumptions? What is this creature and how old he is?
How it must have been interesting - take away land long forgotten secrets © k / f "Gentlemen of Fortune»
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