fossil

Fossil Shark Tooth

Chondrichthyes teeth

Hardness varies around 5 on the Mohs scale due to fossilization. Color ranges from grey to tan, brown, and black depending on surrounding minerals.

Identified November 1, 2026More fossil →

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Physical properties

Hardness varies around 5 on the Mohs scale due to fossilization. Color ranges from grey to tan, brown, and black depending on surrounding minerals.

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

Prized by fossil collectors and used in jewelry making.

Sharks lose thousands of teeth in a lifetime, making teeth the most common shark fossil found worldwide.

Identified by a triangular shape, often with serrated edges and a distinct root. Commonly found in ancient marine deposits and riverbeds.

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