fossil

Fossil Shark Tooth

Chondrichthyes (class)

Hardness 4-5 on Mohs scale for fossilized dentine and enamel, typically brown, grey, or black color with vitreous to dull luster.

Identified October 23, 2026More fossil →

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Physical properties

Hardness 4-5 on Mohs scale for fossilized dentine and enamel, typically brown, grey, or black color with vitreous to dull luster.

Formed through the process of permineralization where minerals replace the original biological material over thousands to millions of years.

Used primarily in fossil collecting, educational displays, and as pendants or jewelry components.

Shark teeth are continuously shed throughout a shark's lifetime, resulting in massive accumulations in sedimentary marine deposits.

Found globally in marine sedimentary layers, riverbeds, and coastal exposures; identified by their distinct triangular or pointed blade shape.

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