Rock Identifier
Small fossil shell (possibly a brachiopod or clam) (Unidentified fossilized bivalve or brachiopod; species cannot be determined from the image) — fossil
fossil

Small fossil shell (possibly a brachiopod or clam)

Unidentified fossilized bivalve or brachiopod; species cannot be determined from the image

AI-generated identification · may be incorrect

A small, tan, domed shell with a dark seam or surface markings. Fossil shells are commonly preserved as calcite or as mineral-filled impressions; hardness and luster cannot be assessed from this image.

Identified More fossil →
Explore Small fossil shell (possibly a brachiopod or clam) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App StoreGoogle Play

Physical properties

A small, tan, domed shell with a dark seam or surface markings. Fossil shells are commonly preserved as calcite or as mineral-filled impressions; hardness and luster cannot be assessed from this image.

Formation & geological history

Likely formed when a marine shell was buried in sediment and preserved during lithification and mineralization. Its geological age and original environment are unknown.

Uses & applications

Primarily valued for collecting and education; some fossil shells are used in displays and jewelry.

Geological facts

Brachiopods and bivalves can look similar, but are different animal groups; the hinge and shell symmetry are key identification features.

Field identification & locations

The specimen is too small and distant for reliable identification. A close-up of both sides and the hinge, plus its locality, would help distinguish a fossil from a modern shell.

More like this

Other fossil specimens

Probable fossil-bearing rock or mineral concretion (Unidentified carbonate-rich concretion with a possible fossil inclusion) — fossil

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

fossil
Likely fossil oyster shell (Fossilized bivalve shell; exact species cannot be identified from the image) — fossil

Likely fossil oyster shell

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

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

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

fossil
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)

fossil
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

fossil