A growing reference on specimens, minerals and the divisions of deep time — written and maintained by the site's admins.
76 entries · page 4 of 7
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Megalodon was a gigantic prehistoric shark from the Cenozoic Era known for its enormous size, p…
The Mesoarchean was the third era of the Archean Eon, spanning 3.2 to 2.8 billion years ago, wh…
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Mononykus was a small, feathered alvarezsaurid theropod dinosaur from the Late Cretaceous known…
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A giant marine reptile that ruled the oceans during the Late Cretaceous, becoming one of the la…
The final era of the Archean Eon, marked by the widespread growth of microbial life, the format…
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Nothronychus was a large feathered therizinosaur dinosaur from the Late Cretaceous known for it…
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Ornithocheirus was a large flying pterosaur from the Early Cretaceous known for its long wings,…
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Oviraptorids were feathered, bird-like theropod dinosaurs from the Late Cretaceous known for th…
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A bipedal herbivorous or omnivorous dinosaur famous for its thick, dome-shaped skull, which liv…
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A large herbivorous horned dinosaur distinguished by its massive bony nasal boss instead of a l…
The Paleoarchean Era lasted from approximately 3.6 to 3.2 billion years ago and represents the …
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Parasaurolophus was a large hadrosaurid dinosaur from the Late Cretaceous known for its long ho…