Fossil Shark Tooth (Crow Shark)
Squalicorax cf. kaupi • Body fossil; Vertebrate (Chondrichthyes)
Geological Period
Late Cretaceous
Estimated Age
72 to 83 million years
Preservation Type
Permineralization with high phosphate content, resulting in a dark, lustrous enameloid surface.
Condition Assessment
Good to Very Good; the crown and serrations appear intact, though the root structure seems partially missing or eroded.
Taxonomic Classification
Phylum: Chordata, Class: Chondrichthyes, Order: Lamniformes, Family: Anacoracidae, Genus: Squalicorax
Morphological Description
Small, flattened, asymmetrical blade-like tooth with a distinct curved distal notch. The crown is dark brown to black with serrated edges (finely preserved) and a slightly convex labial face.
Rock Matrix
None attached; likely originated from a phosphate-rich greensand or limestone matrix typical of marine deposits.
Formation & Location
Commonly found in the Niobrara Formation (USA) or the phosphate mines of Morocco (Khouribga Basin).
Size & Dimensions
Approximately 10-15mm in length; typical for juvenile or posterior teeth of this genus.
Value & Rarity
Estimated Market Value
5 USD to 15 USD
Auction Estimate
10 USD to 20 USD (usually sold in lots rather than individual specimens)
Rarity Assessment
Common; Squalicorax teeth are among the most frequently discovered shark fossils in Cretaceous marine sediments.
Scientific Significance
Squalicorax was a widespread scavenger and predator; these teeth provide data on Late Cretaceous marine food webs and indicate the presence of diverse shark populations.
Preparation Recommendations
Keep dry; no chemical preparation needed. Display in a small acrylic gem jar to protect the delicate serrated edges from abrasion.
Notable Features
Features a classic 'anacoracid' shape with a sharp distal heel; the deep coloration suggests a mineral-rich depositional environment.