lyasia Newmuis

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lyasia Newmuis

Eras of life

Geologic Time Scale

The Paleozoic era is the first real Era that occured on Earth.. .In this era Graptolites, orthocerous, & primitive fish, and the first vertebrates began to appeare. In the Cambrian Period the first organisms began to form like, Algae, Jelliyfish, worms, and invertebrates .In the next period called the Ordovician period, Orthoceras which are straight-shelled mollusk-came in. After the Ordovician period the Silurian Period came and plants and animals started moving on to land., but they really started flourishing in the Carboniferous period . In the Devonian Period the planet's apperaence was changing. The supercontinent of Gondwana headed northward, away from the South Pole, and a second supercontinent began to form the Equator which was Known as Euramerica, or Laurussia Fish and forests also appeared.. lastly the permain period erouse and early amniotes grew into the ancestral groups of the mammals, turtles, lepidosaurs and archosaurs

Paleozoic Era

'Snowball Earth'

There are three eras that occured on this earth as life began to evolve called the Paleozoic, Mesozoic, and Cenozoic eras. A method scientist use to what is the geologica time scale used to to divide the Earth's natural history into to partsto study the evolution of life.

Mesozoic Era

Before the Paleozoic Era, the Neoproterozoic Era occured and had the most severe glaciation known in the geologic record during the Cryogenian,. Ice sheets reached the equator and formed a possible Snowball Earth. It was so severe that ice sheets even covered the equator..

Cambrian Era

The Mesozoic Era is the second era to appeare on this earth. It is divided into three periods called theTriassic, Jurassic, and Cretaceous periods. In the Triassic period, It began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished. Archosaurs and dinosaurs, first appeared in the Late Triassic but did not become dominant until the Jurassic period.The new supercontinent of Pangaea existed until the mid-Triassic, After it gradually separated into two separate landmasses, Laurasia to the north and Gondwana to the south. The global climate during the Triassic was mostly hot and dry. The climate shifted and became more humid as Pangaea began to drift apart. Bythe end of the period was It was marked by another major mass extinction, which whipeed out many groups and allowing dinosaurs to assume dominance. in the Jurassic period.

Last, but not least the Cenozoic Period, iwhic hs the current and most recent of the three Phanerozoic geological eras is the mark where dinosours became extinct and more mammals amphibians, and reptiles appeared and Pangea separated into different parts.


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