Rock Identifier
Fossil shell, likely a brachiopod or bivalve (Uncertain from the photograph; possibly a ribbed brachiopod or marine bivalve fossil) — fossil
fossil

Fossil shell, likely a brachiopod or bivalve

Uncertain from the photograph; possibly a ribbed brachiopod or marine bivalve fossil

AI-generated identification · may be incorrect

Small, rounded shell fossil with strong radiating ribs and gray-white mineralized surface. Original shell material and hardness cannot be determined visually; fossils are commonly preserved in calcite or sedimentary rock.

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Physical properties

Small, rounded shell fossil with strong radiating ribs and gray-white mineralized surface. Original shell material and hardness cannot be determined visually; fossils are commonly preserved in calcite or sedimentary rock.

Formation & geological history

Formed when a marine shell was buried in sediment and mineralized during fossilization. Its age and exact depositional setting cannot be established from the image.

Uses & applications

Primarily collected for display, education, and paleontological study; not generally used in construction or jewelry.

Geological facts

The prominent ribs are shell ornamentation, which can help distinguish fossil groups, but the visible view does not show enough features for a reliable species identification.

Field identification & locations

Look for a matching opposite valve, hinge or opening, and rib symmetry; these features help separate brachiopods from bivalves. Fossil shells commonly occur in marine limestone and shale worldwide.

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Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

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Likely fossil oyster shell

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

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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

Fossil oyster shell

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) — fossil

Weathered fossil bone fragment (identification uncertain)

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

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