fossil

Crinoid Fossil

Crinoidea

AI-generated identification · may be incorrect

Hardness 3-4 on Mohs scale; gray, brown, or earthy colors; vitreous to dull luster; circular or star-shaped stem columnals with radial symmetry.

Identified November 13, 2026More fossil →

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Physical properties

Hardness 3-4 on Mohs scale; gray, brown, or earthy colors; vitreous to dull luster; circular or star-shaped stem columnals with radial symmetry.

Formation & geological history

Formed by the fossilization of marine invertebrate echinoderms living from the Ordovician period to the present, preserved in limestone and shale marine deposits.

Uses & applications

Used primarily by fossil collectors, educational displays, and occasionally in polished decorative lapidary items.

Geological facts

Often referred to as 'stone lilies' due to their plant-like appearance, though they are actually animals related to starfish and sea urchins.

Field identification & locations

Identified by distinctive disk-like columnal segments with central holes, frequently weathered out of Paleozoic limestone formations worldwide.

Other fossil specimens

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Probable fossil-bearing rock or mineral concretion

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

fossil

Fossil

Invertebrate fossil / Trace fossil

fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

fossil

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