Earths Past pt.2

Earths Past pt.2

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  • 248-208 million years ago, "Triassic Period". The first dinosaurs, mammals, and crocodyloformes appear. Mollusks are the dominant invertebrate. Triassic period ends with a minor extinction 213 mya. This allowed the dinosaurs to expand into many niches.
  •  208 to 146 million years ago, "Jurassic Period". The first birds appear, and minor extinctions at 190 and 160 mya.
  • Tertiary Period65 to 1.8 mya. First large mammals and primitive primates, plesiadapiforms Mammals abound. Rodents appear. Starts with a minor extinction (36 mya). More mammals, including the horses, dogs and bears. First hominids (australopithecines). Modern forms of whales.
  • Quaternary Period"The Age of Man"1.8 mya to today. The first humans (Homo sapiens) evolve. A mass extinction of large mammals and many birds happened about 10,000 years ago, probably caused by the end of the last ice age. Human civilization was created.
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