Precambrian
Код 2479264
- ISBN: 978-5-5121-5971-2
Код 2479264
High Quality Content by WIKIPEDIA articles! The Precambrian (Pre-Cambrian) is the name which describes the large span of time in Earth`s history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale. It spans from the formation of Earth around 4600 Ma (million years) ago to the beginning of the Cambrian Period, about 542 Ma, when macroscopic hard-shelled animals first appeared in abundance. The Precambrian is so named because it precedes the...
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