Rock Identifier
Fossil oyster shell (Fossilized bivalve mollusk shell; exact species and age cannot be determined from the image) — fossil
fossil

Fossil oyster shell

Fossilized bivalve mollusk shell; exact species and age cannot be determined from the image

AI-generated identification · may be incorrect

Irregular, layered shell with pale gray-white and tan coloration and a dull to slightly pearly luster. Original shell material may be calcite or aragonite; hardness and crystal structure are not reliably measurable from the photo.

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Physical properties

Irregular, layered shell with pale gray-white and tan coloration and a dull to slightly pearly luster. Original shell material may be calcite or aragonite; hardness and crystal structure are not reliably measurable from the photo.

Formation & geological history

Formed as a marine bivalve shell and buried in sediment, where mineral replacement or infilling preserved it as a fossil. Geological age is undetermined.

Uses & applications

Primarily collected for education and display; fossil shell material is occasionally used decoratively.

Geological facts

The layered, curved form and growth lines are characteristic of many oysters and other bivalves.

Field identification & locations

Look for a cupped, irregular shell shape, concentric growth layers, and possible attachment scars. Fossil bivalves occur in marine sedimentary rocks worldwide; the pictured specimen’s locality is unknown.

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Fossilized bivalve shell; exact species cannot be identified from the image

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Crinoid Stem Fossil in Matrix (Phylum Echinodermata, Class Crinoidea) — fossil

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Phylum Echinodermata, Class Crinoidea

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Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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Fossil oyster shell (Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)) — fossil

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Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)

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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

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