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The Ordovician /?rd?'v???n/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago (ICS, 2004). It follows th ...
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The Mesozoic Era is an interval of geological time from about 252 to 66 million years ago. It is often referred to as the Age of Reptiles because reptiles, namely non-avian dinosaurs, were the dominan ...
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The Paleozoic (or Palaeozoic) Era (from the Greek palaios, "old" and zoe, "life", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic Eon, s ...
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