fossil

Fossilized Gastropod

Gastropoda

Mohs hardness typically 3-4 depending on mineral replacement; color ranges from brown to gray; dull to vitreous luster; coiled shell morphology.

Identified November 12, 2026More fossil →

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Physical properties

Mohs hardness typically 3-4 depending on mineral replacement; color ranges from brown to gray; dull to vitreous luster; coiled shell morphology.

Formed in marine or freshwater sedimentary environments when shells are rapidly buried in sediment and mineralized over millions of years.

Valued by fossil collectors, educational displays, and paleo-geological research.

Gastropods are among the most successful and diverse mollusks, dating back over 500 million years to the Cambrian period.

Found worldwide in sedimentary rock layers, particularly in ancient marine limestone and shale deposits.

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

Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image