Rock Identifier
Echinoid Fossil (Echinoidea) — fossil
fossil

Echinoid Fossil

Echinoidea

AI-generated identification · may be incorrect

Hardness of 3 on the Mohs scale, typically grayish-brown to tan in color, dull or earthy luster, pentameral radial symmetry, and calcitic composition.

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Physical properties

Hardness of 3 on the Mohs scale, typically grayish-brown to tan in color, dull or earthy luster, pentameral radial symmetry, and calcitic composition.

Formation & geological history

Formed through the fossilization of marine invertebrates (sea urchins) in shallow marine sedimentary environments over millions of years.

Uses & applications

Used primarily as educational specimens, display pieces, and for paleontological study.

Geological facts

Commonly known as 'fairy loaves' or fossil sea urchins, these specimens often weather out of limestone and chalk deposits.

Field identification & locations

Easily identified by their rounded, heart-shaped, or circular form featuring distinct five-point star patterns; found worldwide in ancient marine sedimentary rock layers.

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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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