fossil

Fossilized Gastropod Shell

Gastropoda (calcium carbonate / aragonite)

Hardness of 3.5-4 on the Mohs scale, vitreous to pearly luster, featuring a distinct coiled spiral structure.

Identified November 10, 2026More fossil →

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Physical properties

Hardness of 3.5-4 on the Mohs scale, vitreous to pearly luster, featuring a distinct coiled spiral structure.

Formed through the process of permineralization or replacement where organic shell material is slowly substituted by minerals over millions of years.

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

Gastropods date back to the Cambrian period, representing one of the most successful and diverse groups of marine and terrestrial animals.

Identified by its distinctive spiral univalve shell structure, commonly found in sedimentary limestone and shale deposits 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

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

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)