Rock Identifier
Crinoid Stem Fossil (Crinoidea columnal) — fossil
fossil

Crinoid Stem Fossil

Crinoidea columnal

AI-generated identification · may be incorrect

Hardness of 3-4 on the Mohs scale due to calcitic composition, typically grey, brown, or tan in color, with a dull to vitreous luster and a distinct circular or pentagonal segmented column structure.

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Physical properties

Hardness of 3-4 on the Mohs scale due to calcitic composition, typically grey, brown, or tan in color, with a dull to vitreous luster and a distinct circular or pentagonal segmented column structure.

Formation & geological history

Formed through the fossilization of marine invertebrate echinoderm stems in ancient shallow seas, primarily dating from the Paleozoic to Mesozoic eras.

Uses & applications

Used widely in education, paleontological research, and as collector specimens or lapidary jewelry material.

Geological facts

Crinoids are often called sea lilies and frequently weather out of limestone layers as fossil beads, historically known in folklore as St. Cuthbert's beads.

Field identification & locations

Easily identified by their coin-like stacked discs and characteristic central canal, commonly found in limestone and shale formations worldwide.

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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
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
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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