PPT-I. The Precambrian

Vendian II Paleozoic A Cambrian 544490 mya B Ordovician 490443 mya C Silurian 443417 mya inverts Brachipods begin to dominate 80 of all individuals C Silurian

417 mya inverts 300 mya 417 300 inverts permian plants 443 devonian silurian carboniferous 251 354 fishes placoderms 359

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