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People think "explosion that must have happened in a second." It didn't. The Cambrian Explosion started approximately 542 million years ago, triggered by an suddenly-oxygen-rich atmosphere and the end of glaciation, and lasted for about 12 million years. This is VERY long.

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During which period in the geologic time scale was there a great increase in the variety of life forms on earth?

The Cambrian Period, approximately 541 million years ago, is known as the "Cambrian Explosion" because of the rapid diversification and increase in the variety of life forms on Earth during that time. This period saw the emergence of most major groups of animals that exist today.


Which is not a major period of the geologic time scale?

Cenozoic is not a major period of the geologic time scale. The scale is broken down into eras. Cenozoic, Mesozoic and Paleozoic are all part of the Phanerozic era.


After precambrian time what are the two basic divisions of the geologic time scale?

The two basic divisions following the Precambrian on the geologic time scale are the Paleozoic Era and the Mesozoic Era. These eras are further divided into periods, such as the Cambrian, Devonian, and Permian in the Paleozoic Era, and the Triassic, Jurassic, and Cretaceous in the Mesozoic Era.


What era of the geologic time scale do you live in?

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Shorter than a period on the geologic time scale?

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What division of geologic time is smaller than an era?

A period is smaller than an era in the geologic time scale. It is further subdivided into epochs and ages.


What division in the geologic time scale is the shortest?

The shortest division in the geologic time scale is an Epoch. Epochs are subdivisions of a period and are typically tens of millions of years long.


Which period in the geologic time scale did the penguins first live in?

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What is a measurement of the earths history divided into time period?

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What is a measurement of the earth history divided into time period?

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What is a measurement of the Earth's history divided into time period?

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Where does the term Cambrian explosion come from?

roman word for whales roman word for whales Cambrian is the first time period in the Paleozoic Era. Like much of the geologic time scale its origin dates to the work of 18th century British geologists. The name was chosen because its was described in Wales. It has long been a practice in science to latinize scientific words. To the Romans, Wales was known as Cambria.