RARE: Onchosaurus numidus Rostral Spine Fossil, Albian Cretaceous, Kem Kem Basin, Morocco

Description

Onchosaurus numidus Rostral Spine Fossil – Albian, Cretaceous: Kem Kem Basin, Morocco

This listing is for an exceptionally rare Onchosaurus numidus fossil rostral spine, dating back to the Albian stage of the Cretaceous Period (~113-100 million years ago). This incredible specimen originates from the Kem Kem Basin, Morocco, one of the most famous fossil-bearing formations known for its rich and diverse vertebrate assemblage.

Species Information – Onchosaurus numidus

Onchosaurus numidus is a member of the Sclerorhynchidae, an extinct group of sawfish-like rays that thrived during the Cretaceous. Unlike modern sawfish, which have cartilage-based skeletons, Onchosaurus had bony rostral spines, which allowed for much better fossilization. These spines were lined with sharp denticles and used as a predatory tool for slashing through schools of fish or scaring off larger marine reptiles.

The discovery of Onchosaurus fossils in the Kem Kem Beds suggests that it inhabited the warm, shallow waters of the ancient Tethys Sea, coexisting with apex predators such as Spinosaurus, Carcharodontosaurus, and Mawsonia (a giant coelacanth fish).

Geological Context – Kem Kem Formation

The Kem Kem Beds of Morocco represent an extensive fossil-rich formation, deposited during the Albian-Cenomanian stages of the Cretaceous Period (~113-93 million years ago). This region, composed of sandstone and mudstone, preserves a dynamic river system where various Cretaceous creatures thrived. The fossilized remains of Onchosaurus numidus are relatively rare compared to other vertebrates found in the formation, making this a highly sought-after specimen.

Specimen Details

• Fossil Type: Rostral Spine (Serrated Sawfish Spine)
• Scientific Name: Onchosaurus numidus
• Age: Albian Stage (~113-100 million years ago)
• Formation: Kem Kem Beds
• Location: Kem Kem Basin, Morocco
• Condition: Well-preserved, with visible serrations and surface detail

Why Buy From Us?

✔ 100% Genuine Fossil – Authentic Onchosaurus numidus rostral spine

✔ Certificate of Authenticity Included

✔ Carefully Selected & Prepared – Comes from the prestigious Alice Purnell Collection, one of the largest ammonite and fossil collections in the world

✔ Scale Cube (1cm) for Size Reference – Please refer to the images for exact sizing

This is a rare and scientifically significant fossil, perfect for collectors, museums, or anyone fascinated by prehistoric marine life. Don’t miss the opportunity to own a piece of Cretaceous history!

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