fossil

Shark Tooth Fossil

Otodus megalodon

Hardness 5 on the Mohs scale, tan to brown color, vitreous to dull luster, composed of fluorapatite and calcium phosphate.

Identified October 18, 2026More fossil →

Get a report just like this from any photo, free.

Physical properties

Hardness 5 on the Mohs scale, tan to brown color, vitreous to dull luster, composed of fluorapatite and calcium phosphate.

Formed through the process of permineralization in marine sedimentary environments during the Cenozoic era, approximately 3 to 23 million years ago.

Prized by fossil collectors, used in educational displays, and crafted into jewelry.

Shark teeth are shed constantly by sharks throughout their lives, making them one of the most common vertebrate fossils found in marine deposits.

Identify by its distinctive triangular shape, serrated edges, and dense enameloid material, frequently found in riverbeds and coastal cliffs.

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

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)