Precambrian
Informal supereon on the geological timescale, spanning from Earth's formation to the Cambrian Period
Nº Q103910 ★★★★
Super Rare · Places
Precambrian
Informal supereon on the geological timescale, spanning from Earth's formation to the Cambrian Period
The Precambrian ( pree-KAM-bree-ən, -KAYM-; pre-Cambrian, or Cryptozoic, sometimes abbreviated pꞒ or PreꞒ) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria, the Latinized name for Wales, where rocks from this age were first studied.
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From Wikipedia
The Precambrian ( pree-KAM-bree-ən, -KAYM-; pre-Cambrian, or Cryptozoic, sometimes abbreviated pꞒ or PreꞒ) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria, the Latinized name for Wales, where rocks from this age were first studied. The Precambrian accounts for 88% of the Earth's geologic time. The Precambrian is an informal unit of geologic time, subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of Earth about 4.6 billion years ago (Ga) to the beginning of the Cambrian Period, about 538.8 million years ago (Ma), when hard-shelled creatures first appeared in abundance.
Text: Wikipédia, CC BY-SA 4.0. · Image: Black Tusk (CC BY 3.0) ·
