fossil

Shark Tooth Fossil

Chondrichthyes fossil

Mohs hardness around 5 due to mineralization; color ranges from tan to black; vitreous to dull luster; composed mainly of fluorapatite.

Identified October 18, 2026More fossil →

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Physical properties

Mohs hardness around 5 due to mineralization; color ranges from tan to black; vitreous to dull luster; composed mainly of fluorapatite.

Formed through the permineralization of discarded shark teeth buried in marine sediment, often dating from the Cretaceous to Neogene periods.

Valued by fossil collectors, educational displays, and used in jewelry making.

Sharks shed thousands of teeth in their lifetimes, making fossilized teeth relatively common in ancient marine deposits.

Found in riverbeds, coastal cliffs, and spoil banks; identified by its triangular shape, enameloid sheen, and distinct root structure.

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)