Rock Identifier
Fossilized Brachiopod in Matrix (Phylum Brachiopoda) — fossil
fossil

Fossilized Brachiopod in Matrix

Phylum Brachiopoda

AI-generated identification · may be incorrect

Hardness 3-4 (calcite), tan to earthy gray color, dull to vitreous luster, embedded in a sedimentary limestone or mudstone matrix.

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Physical properties

Hardness 3-4 (calcite), tan to earthy gray color, dull to vitreous luster, embedded in a sedimentary limestone or mudstone matrix.

Formation & geological history

Formed through the accumulation and permineralization of marine invertebrate shells in shallow Paleozoic or Mesozoic seas.

Uses & applications

Valued primarily for educational purposes, fossil collecting, and decorative display items.

Geological facts

Brachiopods are ancient marine animals that resemble clams superficially but belong to an entirely different phylum with a muscular stalk called a pedicle.

Field identification & locations

Identify in the field by searching sedimentary rock exposures for distinct symmetrical bivalved shells; common in limestone formations globally.

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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
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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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