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Hexanchus Griseus Shark Tooth 46mm


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Good collector grade Cow shark tooth of attractive light colour enamel unearthed at the Ouled Abdoun Basin formation of Morocco. The six-gilled extinct shark's tooth has been cleaned and conserved. Every single tooth has distinct attributes to both mesial and distal sides, leading up to the archetypical comb apical crowns. Good root including cusplets. Read the fuller description below...

Genus: Hexanchus griseus (Cow shark) - Hexanchidae; described by Bonnaterre, 1788
Age: Cenozoic era, late Palaeocene, approximately 50 to 70 million years.
Origin: Phosphate deposits of Khouribga, Ouled Abdoun Basin, Northern Sahara, Morocco.

Cow Shark tooth measurements.
Width: 4.3 cm
Height: 3.0 cm

Approximate weight: 0,007 g

Read about the phosphate deposits of Morocco go to Wikipedia >

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Very Good fossilised prehistoric Cow shark tooth exhibiting good morphology and preservation, the delicate tooth re-fixed post the small serrations to the medial edge otherwise intact. Often these small shark teeth suffer damage in the fossil bed and on excavation requiring conservation work including cleaning off any attached matrix (fine fossil bed sand grains) and re-fixing where necessary. The typical tooth is recognised by the comb-like structure of the apical crowns. Each cusplet form the triangular apical point. The medial cusplet being the largest is typified with finer serrations along the leading edge. These are referred to as coarse serrations.

The species Hexanchus agassizi, described by Cappetta, 1976, first appeared in the late Cretaceous period around 100 million years ago. While N. cepedianus, Notorynchus, described by Ayres, 1855 appears around the late Paleocene 60 million years ago. The cow shark tooth here was discovered in Morocco in North Africa. Refer to the above link in our short distribution for topographical information on the fossil bed in Morocco. The range of the six-gill sharks was then and still is today, worldwide.

The ancestors of the prehistoric six-gill sharks persist in today's oceans, the deepwater sharks belong to the family Hexanchidae. Characterised by a broad, pointed head, six pairs of gill slits, comb-like yellow lower teeth, and long tails. Six-gill sharks attain sizes of up to 8 metres in length, weighing over 600 kg (1320 lb.). Being abyssal plain scavengers with a keen sense of smell they can be found among the first predators to arrive at carrion and have been found at depths to 2,500 ft (760 m).


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