Precambrian - Wikipedia
WebThe Precambrian (/ p r i ˈ k æ m b r i. ə n,-ˈ k eɪ m-/ pree-KAM-bree-ən, -KAYM-; or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon.
Precambrian | Life, Climate, & Facts | Britannica
WebPrecambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, approximately 541 million years ago. The Precambrian represents more than 80 percent of the total geologic record.
Precambrian Time Information and Prehistoric Facts - National …
WebREFERENCE. Precambrian Time. Learn more about the period that occurred 4.5 billion to 542 million years ago. 4 min read. Precambrian time covers the vast bulk of the Earth's history, starting...
Precambrian - Simple English Wikipedia, the free encyclopedia
WebPre-cambrian (or Precambrian) is a term used to describe the eons before the Cambrian. It lasted from about 4.567 billion years BC to about 542 million years BC. It starts with the beginning of the Earth, about 4.567 billion years BC. When it ends, there were many hard-shelled animals around.
Precambrian | Natural History Museum
WebThe Precambrian encompasses nearly 90% of the history of the Earth and around a third of the history of the Universe. The Precambrian begins with the formation of the Solar System 4.57 billion years ago (bya) and extends to the beginning of the Cambrian 540 million years ago (Mya, or 0.54 bya).
Precambrian body plans - Wikipedia
WebPrecambrian body plans. The Precambrian dates from around 3850 to 542 million years ago. The Neoproterozoic is characterized by a large glaciation event, followed by the appearance of the first multicellular body plans before the Cambrian Explosion. Until the late 1950s, the Precambrian was not believed to have hosted multicellular organisms.
Precambrian - Ancient Life, Fossils, Eons | Britannica
WebIt is now known that Precambrian rocks contain evidence of the very beginnings of life on Earth —which, based on the age of the rocks that contain the oldest evidence of life, took place nearly 3.5 billion years ago—the explosion of life-forms without skeletons before the Cambrian, and even the development of sexual reproduction.
Precambrian - New World Encyclopedia
WebThe Precambrian (or Pre-Cambrian) is an interval of geologic time of roughly 4 billion years, beginning with the formation of Earth around 4500 million years ago (mya) and continuing until the abrupt appearance in the fossil record some 542 mya of abundant macroscopic hard-shelled animals. That event marks the beginning of the Cambrian period .
Precambrian time and its division | Britannica
WebPrecambrian time, Interval of geologic time from c. 4.6 billion years ago, the age of the oldest known rocks, to 541 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important evidence of how the continents evolved.
The Precambrian - University of California Museum of Paleontology
WebThis stretch of time is called the Precambrian. To speak of "the Precambrian" as a single unified time period is misleading, for it makes up roughly seven-eighths of the Earth's history. During the Precambrian, the most important events in biological history took place. Consider that the Earth formed, life arose, the first tectonic plates arose ...
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