Category Archives: Cretaceous Period

Plesiosaur:

Plesiosaur Timeline: Jurassic through Cretaceous Period Is a carnivorous aquatic reptile with a broad body and a short tail. Retaining their ancestral two pairs of limbs, which evolved into large flippers. They were slow swimmers. The name applies to the … Continue reading

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Prehistoric Sea Urchin: Tylocidaris clavigera

Prehistoric Sea Urchin Tylocidaris clavigera Timeline: Cretaceous Period Cidaris clavigera was named by Mantell (1822). It is not a trace fossil. It is the type species of Tylocidaris. It is an extinct genus of echinoid that lived from the Early … Continue reading

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Rudist Bivalve: Hippurites radiosus

Rudist Bivalve Hippurites radiosus Timeline: Late Cretaceous Period Location of fossil: Charente, France Holes bored in the upper shell by organisms that lived above the sediment show that this rudist lived with most of its shell buried. fossil at National … Continue reading

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Ammonites

Fossil display at National Museum of Natural History Smithsonian, National Mall, Washington, D.C. Ammonites Timeline: Jurassic / Cretaceous Period (256-65 Million years ago) Maximum size: 2.6 meters (8.5 feet) in diameter Predator advantage: tentacles, large beak Likely prey: Fishes, mollusks, … Continue reading

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