fossil

Crinoid Columnal Fossil

Crinoid ossicle (Echinodermata)

Hardness 3-4 on Mohs scale, brown to grey color, dull to vitreous luster, often exhibits radial symmetry with a central lumen.

Identified November 13, 2026More fossil →

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Physical properties

Hardness 3-4 on Mohs scale, brown to grey color, dull to vitreous luster, often exhibits radial symmetry with a central lumen.

Formed through the fossilization of marine crinoid stem segments in shallow marine environments over hundreds of millions of years.

Valued by fossil collectors, educational displays, and sometimes used in jewelry making.

Crinoids are commonly known as sea lilies and date back over 480 million years to the Ordovician period.

Easily identified by their coin-like discs with distinctive central holes, frequently found in limestone and shale formations worldwide.

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Likely fossil oyster shell

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

Fossil

Invertebrate fossil / Trace fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

Porous limestone pebble

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