How did the shape look like?
Was it a triangula and under the dirth they had a structur "zebra like"?: Dreissena polymorpha (zebra mussel)
Was it found nearby a river/creek ?: Unio crassus (thick shelled river mussel)
or...
When I see how they are gorwn in bulk of mussels I think its the "Dreissena polymorpha (zebra mussel)".
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