fossil

Fossilized Shark Tooth

Chondrichthyes tooth

Hardness varies between 3.5 and 5 on the Mohs scale depending on mineralization. Colors range from black, brown, and grey to blue.

Identified October 28, 2026More fossil →

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Physical properties

Hardness varies between 3.5 and 5 on the Mohs scale depending on mineralization. Colors range from black, brown, and grey to blue.

Formed through the process of permineralization where organic tooth material is replaced by minerals over millions of years.

Valued primarily by fossil collectors, used in jewelry, and studied by paleontologists to understand ancient marine ecosystems.

Shark teeth are shed constantly throughout a shark's lifetime, leading to abundant deposits in ancient marine sediments.

Commonly found in riverbeds, eroding cliffs, and coastal beaches where ancient sea floors are exposed.

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