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Period: 443 to 417
Silurian Period
During the Silurian, continental elevations were generally much lower than in the present day, and global sea level was much higher. This rising prompted changes in climatic conditions that allowed many faunal groups to recover from the extinctions of Late Ordovician times. Mound-type coral reefs were very common. Fishes were widespread. Vascular plants began to colonize coastal lowlands during the Silurian Period, whereas continental interiors remained essentially barren of life. -
Period: 490 to 458
Ordovician Period
The Ordovician Period seen significant changes in plate tectonics, climate, and biological systems. Rapid seafloor spreading at oceanic ridges fostered some of the highest global sea levels in the Phanerozoic Eon. As a result, continents were flooded to an unprecedented level, with North America almost entirely underwater at times. These seas deposited widespread blankets of sediment that preserved the extraordinarily abundant fossil remains of marine animals. -
Period: 543 to 1 CE
Phanerozoic Eon
The Phanerozoic Eon is the time of visible life including now. its came after the Precambrian Eon and Proterozoic Era -
Period: 543 to 248
Paleozoic Era
The Paleozoic Era sore the extreme diversity of marine life. this began at the end of the Precambrian Eon -
Period: 543 to 490
Cambrian Period
The Cambrian period was the beginning of more complicated land animals most having shells. -
Period: to 543
Proterozoic Eon
Proterozoic rocks identified with important sources of metallic ores: iron, gold, copper, uranium, and nickel. During the Proterozoic, the atmosphere and oceans changed significantly. Proterozoic rocks contain many definite traces of primitive life-forms. The fossil remains of bacteria and blue-green algae, as well as of the first oxygen-dependent animals, the Ediacara fauna. -
Period: to 543
Precambrian Eon
The Precambrian Eon is the earliest part of Earths history and included the Archean and Proterozoic eras. Was around 3800 millions of years ago till about 543 millions of years ago. -
Period: to
Archean Eon
Archean period was the formation of earths crust and oceans. Fossil evidence of the earliest primitive life-forms, prokaryotic microbes from the domain called Archaea and bacteria appears in rocks.