fossil

Spinosaurid Dinosaur Tooth

Spinosaurus aegyptiacus (fossilized)

Hardness: Approx. 5 (mineralized enamel); Color: Brown to rust-orange due to iron oxidation; Luster: Sub-vitreous to dull; Structure: Conical, non-serrated with longitudinal fluting (ridges).

Hardness: Approx
Color: Brown to rust-orange due to iron oxidation
Luster: Sub-vitreous to dull

Identified April 6, 2026More fossil →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: Approx. 5 (mineralized enamel); Color: Brown to rust-orange due to iron oxidation; Luster: Sub-vitreous to dull; Structure: Conical, non-serrated with longitudinal fluting (ridges).

Formation & geological history

Formed through permineralization during the Cretaceous period (approx. 95-100 million years ago). Found in the Kem Kem Group of Morocco, which was once a lush river system.

Uses & applications

Paleontological study, educational displays, and private fossil collection. Small specimens are often used in wire-wrap jewelry.

Geological facts

Unlike most theropod teeth, Spinosaurus teeth are conical and lack serrations, adapted for catching slippery fish like the giant Onchopristis (prehistoric sawfish).

Field identification & locations

Identify by its distinct conical shape and vertical ridges. These are very common in fossil shops because Spinosaurus shed teeth frequently and they preserved well in the Moroccan riverbeds.

Other fossil specimens

See all

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

sedimentary

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

sedimentary

Fossiliferous Limestone (Crinoidal)

Calcite-bearing bioclastic packstone (CaCO3)

sedimentary

Orthoceratid Fossil in Limestone

Orthoceras (extinct genus of Nautiloid Cephalopod)

sedimentary

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

sedimentary

Turritella Agate (Elimia Agate)

Silicified Elimia tenera (formerly misidentified as Turritella)

sedimentary (silicified fossiliferous chalcedony)