Rock Identifier
Brachiopod Fossil (Phylum Brachiopoda) — fossil
fossil

Brachiopod Fossil

Phylum Brachiopoda

AI-generated identification · may be incorrect

Hardness 3 on Mohs scale (for calcite shell); gray to tan color; dull to vitreous luster; bivalved symmetrical shell structure; specific gravity around 2.7.

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Physical properties

Hardness 3 on Mohs scale (for calcite shell); gray to tan color; dull to vitreous luster; bivalved symmetrical shell structure; specific gravity around 2.7.

Formation & geological history

Formed through the replacement of ancient marine organism shells by minerals in sedimentary environments, dating from the Paleozoic to Mesozoic eras.

Uses & applications

Used for educational purposes, scientific research, and as collector specimens.

Geological facts

Brachiopods are marine animals that date back over 500 million years and superficially resemble clams, though they are phylogenetically distinct.

Field identification & locations

Identify by the distinct symmetry lines and beak structure on limestone or shale outcrops; commonly found worldwide in ancient marine sedimentary deposits.

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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
Porous limestone pebble (Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image) — sedimentary

Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

sedimentary
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