HSEA 010 Lecture Notes - Lecture 2: Paleozoic, Paleoarchean, Orosirian
28 Jul 2020
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Document Summary
On the geological time scale, the first and longest stage in the history of earth is known as. It has its beginning in the formation of the planet itself, around 4,570 million years ago. It is considered an informal division of geological time, whose appropriate name would be that of the precambrian supereon. The precambrian lasted about 4,027 million years approximately, and ended about 542 million years or so ago, with the beginning of the phanerozoic eon and its first era, the paleozoic, and its first period: the cambrian. Logically, everything that came before the cambrian period is considered part of the precambrian. In this period of time the planet was formed, the first geological events began and life on earth began. Despite its importance, the study of the precambrian is difficult, since there are almost no fossil records and the rocks formed in those times have changed greatly over billions of years of transformation.
