Rock Identifier
Fossilized Brachiopod (Phylum Brachiopoda) — fossil
fossil

Fossilized Brachiopod

Phylum Brachiopoda

AI-generated identification · may be incorrect

Hardness varies around 3-4 on the Mohs scale depending on mineral replacement. Color ranges from grey to tan and brown, with a dull to earthy luster and bilateral shell symmetry.

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Physical properties

Hardness varies around 3-4 on the Mohs scale depending on mineral replacement. Color ranges from grey to tan and brown, with a dull to earthy luster and bilateral shell symmetry.

Formation & geological history

Formed through the fossilization of marine invertebrate animals in shallow Paleozoic or Mesozoic seas over hundreds of millions of years.

Uses & applications

Valued primarily for educational study, fossil collecting, and decorative display pieces.

Geological facts

Brachiopods are ancient marine organisms that date back over 500 million years to the Cambrian period and superficially resemble clams.

Field identification & locations

Identify by their distinct symmetrical bivalve shells often found embedded in limestone or shale sedimentary layers.

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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

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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