What is it?

[Yuriy]

Found in Abkhazia, in the old ruined fortress.

 

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[dozer dan]

isn't it obvious? its a fossil of a "gold fish"

 

[Yuriy]

Generally the fish a Christian symbol.

 

[High Plains Digger]

I have dug those in Kemmerer, Wyo. I think. Well, sort of.