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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
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∙ 12y ago
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∙ 13y agoWell, the Cambrian period was between 542 million years ago and 488.3 million years ago. Pre-Cambrian would refer to the length of time between the origin of the earth up until the Cambrian period, which includes both the Archaean and the
Proterozoic era. The time period would be from 4.6 billion years ago until 542 million years ago (a really, really long period of time!).
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∙ 11y agoThe span of time from Earth's formation to the start of the Cambrian period.
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∙ 15y agoThe Cambrian is the first geological period of the Phanerozoic eon, lasting from 542 ± 0.3 million years ago to 488.3 ± 1.7 million years ago
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∙ 13y agoIt is the era which occurred about 550 million years ago when animal life exploded onto the scene, here on planet Earth.
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∙ 11y agoThere is no era before Pre-cambrian era. It is the most oldest era according to geological scale.
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∙ 11y agoPer-Cambrian
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∙ 13y agoThe Pre Cambrian lasted 4058000000 years
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∙ 14y agoThe Pre-Cambrian (Actual name)
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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.
Was the Cambrian explosion a volcanic eruption?
yes
What what is the Cambrian explosion?
The sudden increase in invertebrate fossil diversity
What statement best describes why the Cambrian explosion was important?
because there was an explosion in ecological diversity among animals
What is the sudden appearance of life in the fossil record called?
The sudden appearance of complex life forms in the fossil record is called the Cambrian Explosion. It refers to a relatively short period in Earth's history, around 540 million years ago, when there was a rapid diversification and emergence of diverse animal species. The Cambrian Explosion marks a significant milestone in the evolution of complex life on our planet.
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.
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.
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.
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.
Was the Cambrian explosion a volcanic eruption?
yes
The Cambrian explosion resulted in the evolution of the first?
land animals
What is the cambrain explosion?
life during the early Cambrian period
What what is the Cambrian explosion?
The sudden increase in invertebrate fossil diversity
What statement best describes why the Cambrian explosion was important?
because there was an explosion in ecological diversity among animals
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.
After the Cambrian explosion what form of life evolved?
Single celled organisms.
