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The Precambrian is the informal name for the large expanse of time preceding the current Phanerozoic Eon (and the Cambrian period, hence the name). It began with the Earth's formation about 4.5 billion years ago and lasted until the advent of multicellular life about 542 million years ago. Overall the planetary environment was drastically different. Life appeared sometime late in the Precambrian, but it is not known when.
The Precambrian "supereon" is divided into three eons: the Hadean, Archaean, and Proterozoic.
Very little is known about the Precambrian, despite the fact that it comprises nearly 90% of the Earth's history. This is simply because Precambrian rocks are so old, and are either heavily metamorphosed, have been destroyed by erosion, or remain buried deep beneath Phanerozoic strata. The fossil record from the time is also very poor, and only some very simple life forms have been found.
Some key events that happened during the Precambrian include:
-Formation of the Earth
-Impact event that tilted the axis at 23.5 degrees and formed the Moon
-Formation of the Earth's crust and the beginning of tectonic activity
-Comet and asteroid bombardments that brought water to the Earth
-Formation of the oceans
-First unicellular life forms
-Oxygenation of the atmosphere by early photosynthetic bacteria
-First multicellular life forms
What else can I help you with?
What period came after the Cambrian period?
The Ordovician period came after the Cambrian period.
What what is the Cambrian explosion?
The sudden increase in invertebrate fossil diversity
Why did the Cambrian explosion may not have been an explosion?
The Cambrian Explosion wasn't a literal explosion. Instead, it was a span of time when organisms evolved into an immense number of new forms, and biodiversity increased greatly, reaching its modern level. The Cambrian Explosion occurred between 530 and 450 million years ago.
The Cambrian period is also called the?
The Cambrian period is also called the "Cambrian explosion" due to the sudden appearance and diversification of many major animal groups.
Was the Cambrian explosion a volcanic eruption?
No, the Cambrian explosion was not a volcanic eruption. It was a period of rapid diversification of multicellular lifeforms that occurred around 541 million years ago, marking the beginning of the Paleozoic era.
What is Cambrian's Big bang?
I assume you are referring to the Cambrian Explosion... It was a period on Earth many millions of years ago after heavy bombardment from asteroids. A huge "explosion" of species and life came to form on Earth.
What era did the Ediacaran Fauna Live?
The Ediacarian fauna are from the Cambrian Explosion. The Cambrian Explosion occurred in the Cambrian period. The Cambrian period was part of the Paleozoic era.
Explosion of life what period?
Cambrian.
Where can you see the evidence of the Cambrian explosion in the world?
Any time you see an animal. The Cambrian explosion was when the different kinds of animals developed - all the different animal phylums. So if you see an insect on a mammal you see the Cambrian explosion.
What period came after the Cambrian period?
The Ordovician period came after the Cambrian period.
What is the cambrain explosion?
life during the early Cambrian period
What what is the Cambrian explosion?
The sudden increase in invertebrate fossil diversity
Animals in the preCambrian period?
The group of animalia (animals) did not fully form until the Cambrian period. There is evidence of simple life (single-celled) and small multi-celled life forms from before the Cambrian explosion.
Why did the Cambrian explosion may not have been an explosion?
The Cambrian Explosion wasn't a literal explosion. Instead, it was a span of time when organisms evolved into an immense number of new forms, and biodiversity increased greatly, reaching its modern level. The Cambrian Explosion occurred between 530 and 450 million years ago.
The Cambrian period is also called the?
The Cambrian period is also called the "Cambrian explosion" due to the sudden appearance and diversification of many major animal groups.
After the Cambrian explosion what form of life evolved?
Single celled organisms.
Was the Cambrian explosion a volcanic eruption?
No, the Cambrian explosion was not a volcanic eruption. It was a period of rapid diversification of multicellular lifeforms that occurred around 541 million years ago, marking the beginning of the Paleozoic era.
