Rock Identifier
Fossilized Echinoid (Echinoidea) — fossil
fossil

Fossilized Echinoid

Echinoidea

AI-generated identification · may be incorrect

Hardness 3 on Mohs scale due to calcite composition. Color ranges from white to yellowish-brown with a dull luster and characteristic pentameral radial symmetry.

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Physical properties

Hardness 3 on Mohs scale due to calcite composition. Color ranges from white to yellowish-brown with a dull luster and characteristic pentameral radial symmetry.

Formation & geological history

Formed through the fossilization of sea urchins in marine sedimentary environments, typically during the Cretaceous period, via mineral replacement by calcite.

Uses & applications

Valued primarily as a collectible geological specimen and for educational purposes in paleontology.

Geological facts

Commonly known as sea urchin fossils, these specimens often preserve intricate surface plates and tubercles of the original organism.

Field identification & locations

Easily identified by their rounded, button-like shape and distinctive star-like petaloid patterns; found worldwide in limestone and chalk deposits.

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Phylum Echinodermata, Class Crinoidea

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Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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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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