What's the difference between hippurite and radiolite?

Hippurite

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Definition:

• (n.) A fossil bivalve mollusk of the genus Hippurites, of many species, having a conical, cup-shaped under valve, with a flattish upper valve or lid. Hippurites are found only in the Cretaceous rocks.

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Radiolite

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Definition:

• (n.) A hippurite.

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