The Neoproterozoic Era is the unit of geologic time from {Ma|Neoproterozoic|Cambrian}. The terminal Era of the formal Proterozoic Eon (or the informal `Precambrian`), it is further subdivided into the Tonian, Cryogenian, and Ediacaran Periods. The most severe glaciation known in the geologic record occurred during the Cryogenian, when ice sheets.....
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An era (1000 to 542 mya) with three periods: Tonian, Cryogenian, and Ediacaran.
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