fossil

Fossil Shark Tooth

Chondrichthyes (tooth)

Hardness varies from 4 to 5 on the Mohs scale depending on mineralization. Colors range from black and brown to grey.

Identified November 10, 2026More fossil →

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Physical properties

Hardness varies from 4 to 5 on the Mohs scale depending on mineralization. Colors range from black and brown to grey.

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

Used primarily in jewelry making, educational displays, and by fossil collectors.

Shark teeth are shed continuously throughout a shark's lifetime, making them one of the most common marine fossils found.

Identified by its triangular shape, serrated edges, and distinctive root structure; frequently found in marine sedimentary 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