Otodus shark tooth
Otodus obliquus • Body fossil (vertebrate dental element)
Geological Period
Paleogene (Paleocene to Eocene epoch)
Estimated Age
Approx. 45 to 60 million years
Preservation Type
Permineralization (specifically phosphatization) where minerals have replaced the original hydroxyapatite of the tooth structure.
Condition Assessment
Good to Very Good. The main crown and tip are intact, and at least one lateral cusplet is clearly visible. The root shows some typical weathering and minor abrasions.
Taxonomic Classification
Phylum: Chordata, Class: Chondrichthyes, Order: Lamniformes, Family: Otodontidae, Genus: Otodus
Morphological Description
Large triangular crown with smooth, non-serrated cutting edges. Highly diagnostic lateral cusplets (small triangular projections) are present on both sides of the main crown. The root is robust and 'V' shaped with a porous texture indicative of phosphate mineral replacement.
Rock Matrix
Specimen is isolated from its matrix, but the sandy coloration and preservation style suggest a phosphate-rich greensand or calcarenite limestone matrix.
Formation & Location
Most commonly sourced from the Phosphate Basins of Morocco (e.g., Khouribga, Oulad Abdoun Basin).
Size & Dimensions
Approximately 2 to 3 inches in slant height; this is a standard adult size for the species.
Value & Rarity
Estimated Market Value
$15.00 - $45.00 USD
Auction Estimate
$20.00 - $60.00 USD for a specimen of this size and quality.
Rarity Assessment
Common. They are harvested in massive quantities from Moroccan phosphate mines, though high-quality, large, un-repaired specimens are more sought after.
Scientific Significance
Otodus obliquus is a key lineage marker in the evolution of megatoothed sharks; it is considered the direct ancestor to Carcharocles megalodon. It represents a top apex predator of the Eocene seas.
Preparation Recommendations
No further mechanical preparation needed. Should be kept in a dry environment. To prevent 'root rot' or crumbling, it can be stabilized with a thin solution of Paraloid B-72 if necessary.
Notable Features
Features the classic 'triple-pronged' appearance due to well-preserved side cusplets and a distinctively thick, bulbous root section typical of the Otodontidae family.