Geologic Time Scale and Brief History of Life on Earth

Handout for GLY 137 The DinosaursThe Geologic time Scale and a Brief History of life on EarthThe Geologic time Scale is divided into four major units: Eons, Eras, Periods andEpochs. An Eon is the longest division of Geologic time , so long in fact that there have onlybeen four Eons. Collectively the first three eons are called the Precambrian, that stretch ofgeological time from the formation of the Earth itself to the start of the Cambrian period. Thisimmensely long stretch of time - some four billion years or more - saw the formation of the Earthas a planetary body, including geosphere, atmosphere, and hydrosphere, as well as theappearance of of the PrecambrianThe Precambrian is divided into the Hadean, which refers to the conditions on th

north of the tropics was almost entirely ocean, and most of the world's land was collected into. the southern super-continent Gondwana. Throughout the Ordovician, Gondwana shifted towards the South Pole and much of it was submerged underwater. The Ordovician is best known for the

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