fossil

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineralized Apatite / Bio-apatite)

Hardness: 5 on the Mohs scale. Color: Tan, beige, light brown, to shiny enamel finish. Luster: Vitreous to enamel-like on crown, dull on root. Structure: Distinct central triangular blade flanked by small side cusplets and a broad root.

Hardness: 5 on the Mohs scale
Color: Tan, beige, light brown, to shiny enamel finish
Luster: Vitreous to enamel-like on crown, dull on root

Identified July 24, 2026More fossil →

Explore Fossilized Shark Tooth (Otodus obliquus) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed during the Paleocene to Eocene epochs (approximately 45 to 60 million years ago). As the shark dropped teeth in marine sediments, organic materials were permineralized with phosphate minerals like apatite over millions of years.

Uses & applications

Popular for jewelry (necklaces, pendants), educational displays, fossil collecting, and lapidary arts.

Geological facts

Otodus obliquus was a massive prehistoric mackerel shark that grew up to 30-33 feet (9-10 meters) in length and is considered a direct evolutionary ancestor to the legendary Megalodon (Otodus megalodon).

Field identification & locations

Identified by the triangular crown with smooth cutting edges and characteristic side cusplets at the base. Commonly found in phosphate mines in Morocco (Khouribga) and marine sedimentary deposits worldwide.

Other fossil specimens

See all

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

fossil

Sedimentary Outcrop (Sandstone/Shale)

Sedimentary bedrock formation (variable composition)

sedimentary

Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

sedimentary

Fossiliferous Limestone

Fossiliferous Calcilutite / Biomicrite

sedimentary

Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

fossil

Fossiliferous Limestone

Limestone with embedded fossil cross-section

sedimentary