Paleogeology, Paleoclimate, in relation to Evolution of Life on Earth


The Phanerozoic Eon stretches from 543 million years ago, at the start of the Cambrian period, to the present.

The classic opening of the Phanerozoic is marked by the appearance of trilobites and archaeocyatha, while fossil finds have pushed the first stratigraphic appearance of the 'small shelly fauna' back a few million years.

The Phanerozoic is subdivided into:
● Paleozoic Era, 542-251 Mya
● Mesozoic Era, 251-65.5 Mya
● Cenozoic Era, 65.6 Mya to present

Each era is further subidived into periods and epochs.

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. . . stratifying since 10/06/06