What does finding a fossilized clam in a limestone layer high in a mountain range indicate about the ancient environment?

Answer

The organism belonged to a marine environment.

The presence of a marine organism like a clam within rock layers indicates that the geological setting where that organism lived was, at that time, submerged under a sea or ocean.

What does finding a fossilized clam in a limestone layer high in a mountain range indicate about the ancient environment?
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