Jan 1, 1111
The Cambrian Period(544-- 245 million years ago) The Cambrian Period was the period of evolution of life on earth. Many marine metazoans having mineralized exoskeletons thrived in the Cambrian period, including sponges, corals, molluscs, echinoderms, bryozoans, brachiopods and arthropods.
Jan 1, 1112
Tommotian Stage (534 to 530 mya)Animals with shells appeared and solar brightness was 6% less than today.
Jan 2, 1113
Ordovician Period (505 to 440 mya)The Ordvician is named after a Celtic tribe called the Ordovices, and was a time that life diversified and specialized. The theory of plate tectonics states that the Earth's outermost layer is fragmented into a dozen or more large and small plates that are moving relative to one another
Jan 1, 1114
Devonian Period (410 to 360 mya)Reef ecosystems saw new and more varied forms, including the ammonoids and fish. It was also a time when life achieved the critical event of adapting to land
Jan 1, 1115
Permian Period (286 to 245 mya)The Permian Period extends from about 286 to 245 million years ago, and is the last geological period of the Palaeozoic Era. Life on land included a diversity of plants, arthropods, amphibians and reptiles.