Jan 1, 1111
Beginning of Paleozoic EraThe Paleozoic Era began 542 million years ago.
Jan 1, 1112
Beginning of the Cambrain periodThe Cambrian peroiod of the Paleozoic Era spanned from 542 million years ago to 488 million years ago.
Jan 2, 1112
Cambrian Period*Global supercontinent, Pannotia, was in the process of breaking up.
*Earth was generally cold.
*Animal life was aquatic. First invertebrates appear.
Jan 1, 1113
Beginning of the Ordovician periodThe Ordovivian period spanned from 488 million years ago to 444 million years ago.
Jan 2, 1113
Ordovician period*Sea levels were high.
*Earth started out very hot, but towards the end of the period, cooled off closer to today's temps.
*Life flourished at first, and then mass-extinction events began to occur. First vertebrates (fishes) appear
Jan 1, 1114
Beginning of Silurian periodThe Silurian period spanned from 444 million years ago to 416 million years ago.
Jan 2, 1114
Silurian period*Supercontinent Gondwana covered the equator and much of the southern hemisphere, a large ocean occupied most of the northern half of the globe.
*Earth was in long warm greenhouse phase.
*First macrofossils seen. First land plants and animals appear.
Jan 2, 1115
Beginning of Devonian periodThe Devonian period spanned from 416 million years ago to 359 million years ago.
Jan 2, 1115
Devonian period*Period of great tectonic activity.
*Exceptionally warm and probably lacked glaciers.
*Primitive anthropods co-evolved. Age of fishes. First amphibians appear.
Jan 1, 1116
Beginning of Carboniferous periodThe Carboniferous period spanned from 359 million years ago to 299 million years ago.
Jan 2, 1116
Carboniferous period*High sea levels.
*Warm in the beginning and then cooled.
*Lots of fish. Forrest and swamps cover the land. Giant cockroaches and dragonflies appear. First reptiles.
Jan 1, 1117
Beginning of the Permian periodThe Permian period spanned from 299 million years ago to 251 million years ago.
Jan 2, 1117
Permian period*Pangea formed.
*Mass extincion events.
Jan 1, 1118
End of the Paleozoic era