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The density of specimens in the Aspidella beds suggests levels of benthic biomass in the Neoproterozoic that could rival those of modern marine communities
They were first found and described by John Locke in 1838
The body was covered with thick
The skull of Conchoraptor was heavily pneumatised
This large enrolled trilobite is from the Devonian of the Alnif region of Morocco
Pliosaur tooth, giant marine reptile Troodon The density of specimens inPLIOSAURUS(pronounced PLY oh SAWR us) Pliosaurus (meaning "greater lizard") was a huge, short necked plesiosaur that lived during the middle to late Jurassic period. This carnivore was a flippered marine reptile (a pliosaur and a plesiosaur, but not a dinosaur) with many sharp teeth in large, powerful jaws resembling those of a crocodile; the teeth were three sided in cross section. It was 33 40 ft (10 12 m) long and the skull was 5 6. 6 ft (1. 5 2 m)
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