Rock Identifier
Fossilized Shark Tooth or Bone Fragment (Vertebrate Fossil (likely Carcharodon or similar genus)) — fossil
fossil

Fossilized Shark Tooth or Bone Fragment

Vertebrate Fossil (likely Carcharodon or similar genus)

AI-generated identification · may be incorrect

Hardness: 5 (Mohs scale), Color: Dark grey to charcoal black, Luster: Dull to sub-vitreous, Structure: Mineralized organic structure with cortical bone texture, Specific Gravity: 2.5-3.0

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Physical properties

Hardness: 5 (Mohs scale), Color: Dark grey to charcoal black, Luster: Dull to sub-vitreous, Structure: Mineralized organic structure with cortical bone texture, Specific Gravity: 2.5-3.0

Formation & geological history

Formed through the process of permineralization, where organic tissue is replaced by minerals over millions of years. This piece likely dates to the Neogene or Paleogene periods (2.5 to 66 million years ago).

Uses & applications

Educational collections, fossil hunting, and occasionally used in jewelry once polished

Geological facts

The dark color is often a result of phosphate mineralization within marine sediments. Many such fragments are found in coastal regions where ancient seabeds are exposed.

Field identification & locations

Identified by its dense, non-porous feel compared to rocks and the presence of faint organic patterns. Common in peace river or coastal areas of the southeastern United States.

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Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

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Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

sedimentary
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Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

sedimentary
Weathered fossil bone fragment (identification uncertain) (Fossilized bone; exact taxon and mineral composition cannot be determined from the image) — fossil

Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

fossil