Stony Coral
Astrangia
Paleobiology
Paleobiology
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Petosky Stone
Hexagonaria percarinata
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Horn Coral
Heterophrentis prolifica
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Fossil Worm
Sabellaria
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Stromatolite
Cyanobacteria
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Horn Coral
Heliophyllum halli
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Gastroliths
Gastrolith
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Stony Coral
Montastrea
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Fossil Sponge
Stromatoporoidea
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Petosky Stone
Hexagonaria percarinata
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Gastroliths
Gastrolith
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Stony Coral
Solenastrea