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THE PRECAMBRIAN TIME ERA is the longest time era ever it lasted 4 billion years

1.5 billion of that 4 was the earth cooling down for life to evolve it had three eras in it including Hadean,Archean and Proterozoic

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Hadean ("Hades-like") Era. This era began with the formation of the earth from dust and gas orbiting the Sun about 4.6 billion years ago. During this era the surface of the Earth was like popular visions about Hades: oceans of liquid rock, boiling sulfur, and impact craters everywhere! Volcanoes blast off all over the place, and the rain of rocks and asteroids from space never ends. It's hard to take a step without falling in a pool of lava or getting hit by a meteor! The air is hot, thick, steamy, and full of dust and crud. But you can't breathe it anyway: it's made of nothing but carbon dioxide and water vapor, with traces of nitrogen and smelly sulfur compounds! Any rocks that do form from cooling lavas are quickly buried under new lava flows or blasted to bits by yet another impact. Some people think that an asteroid as large as the planet Mars hit the Earth near the beginning of the Hadean era, completely smashing and melting the Earth and forming the Moon as part of the "splash!"  Wow!  No one has found any rocks on earth from this era. Only meteorites from space and moon rocks are this old.  If any life formed on earth during this era, it was probably destroyed.
HADEAN EARTH

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Proterozoic ("Early Life") Era. Well, here we are about 700 million years ago, near the end of the longest time period in geologic history. It began about two billion years after the formation of the earth and lasted about another two billion years! what lived during this era, single-celled anaerobic prokaryotes, which were replaced by photosynthetic prokaryotes like cyanobacteria. Proterzoic Earth

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Archean ("Ancient" or "Primitive") Era This era begins about a billion years after the formation of the earth. The Late Heavy Bombardment is hypothesized to overlap with the beginning of the Archean. The Huronian glaciation occurred at the end of the eon. Archean Earth

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Paleozoic (541-252 million years ago) means 'ancient life. ' The oldest animals on Earth appeared just before the start of this era in the Ediacaran Period, but scientists had not yet discovered them when the geologic timescale was made. What animals lived in Paleozoic Era?

Paleozoic Era: Life

The "Cambrian fauna" typified the Cambrian oceans; although members of most phyla were present during the Cambrian, the seas were dominated by trilobites, inarticulate brachiopods, monoplacophoran molluscs, hyolithids, "small shelly fossils" of uncertain systematic posiiton, and archaeocyathids.

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The Mesozoic Era (251.9 to 66.0 million years ago) was the "Age of Reptiles." During the Mesozoic, Pangaea began separating into the modern continents, and the modern Rocky Mountains rose. Dinosaurs, crocodiles, and pterosaurs ruled the land and air. The first dinosaurs, marine reptiles, lizards, and tortoises appeared. Mammals appeared during the Triassic, but they remained insignificant until their competitors, the dinosaurs, became extinct at the end of the Cretaceous. Crocodiles were abundant. It was in this period that insects attained complete metamorphosis.

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Cenozoic (66 million years ago until today) means 'recent life. ' During this era, plants and animals look most like those on Earth today. Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow. This is also the era we are living in now.

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Cenozoic Era- Geologic & Biological Events, Including Primate Evolution | GEO GIRL