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cambrian
Cambrian period had alot of unicelluar orgamisms. The multi celluar organisms came millions of years later. The end of the period was known as the extinction event. -
ordovican period
second of six paleothic eras. fish and other animals arrived. -
silurian
identified by a british geologist. earth entered a long warn greenhouse phase. -
devonian
The Devonian period experienced the first significant adaptive radiation of terrestrial life. The Late Devonian extinction severely affected marine life, killing off all placoderms, and all trilobites, save for a few species of the order Proetida. -
carboniferious
The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 358.9 million years ago, to the beginning of the Permian Period. Found by geologists William Conybeare and William Phillips in 1822 -
permian
The world at the time was dominated by a single supercontinent known as Pangaea, surrounded by a global ocean called Panthalassa. The extensive rainforests of the Carboniferous had disappeared, leaving behind vast regions of arid desert within the continental interior. -
tarrisic
It is the first period of the Mesozoic Era, and lies between the Permian and Jurassic periods. Both the start and end of the period are marked by major extinction events. -
Jurassic
The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period is marked by the major Triassic–Jurassic extinction event. Two other extinction events occurred during the period: the Late Piensbachian/Early Toarcian event in the Early Jurassic, and the Late Tithonian eventat the end; however, neither event ranks among the 'Big Five' mass extinctions. -
Cretaceous
These oceans and seas were populated with now extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. At the same time, new groups of mammals and birds, as well as flowering plants, appeared. The Cretaceous ended with a large mass extinction, the Cretaceous–Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles, died out. -
Tertiary
Tertiary is an officially deprecated but still widely used term for a geologic period from 65 million to 1.806 million years ago, a time span that lies between the superseded Secondary period and the Quaternary. -
Quaternary
The Quaternary Period is the most recent of the three periods of the Cenozoic Era in the geologic time scale of the ICS.[4] It follows the Neogene Period and spans from 2.588 ± 0.005 million years ago to the present. The relatively short period is characterized by a series of glaciations and by the appearance and expansion of anatomically modern humans.
