fossil

Fossilized Shark Tooth

Chondrichthyes tooth fossil

Hardness of 5 on the Mohs scale due to mineralization, brown or gray color, glassy to dull luster, and distinct triangular or pointed crown shape.

Identified October 31, 2026More fossil →

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Physical properties

Hardness of 5 on the Mohs scale due to mineralization, brown or gray color, glassy to dull luster, and distinct triangular or pointed crown shape.

Formed through the process of permineralization, where original organic material is replaced by minerals over thousands to millions of years.

Valued primarily for fossil collecting, educational displays, and sometimes crafted into jewelry.

Shark teeth are shed continuously throughout a shark's lifetime, resulting in massive fossil deposits in ancient marine sediments.

Found worldwide in sedimentary rock formations, riverbeds, and coastal cliffs, often discovered by sifting through gravel or searching eroded banks.

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