Precambrian
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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. Th
* Calculated from Wikipedia data.
Accuracy is not guaranteed.
| Precambrian | ||||||
|---|---|---|---|---|---|---|
| Chronology | ||||||
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| Proposed subdivisions | See Proposed Precambrian timeline | |||||
| Etymology | ||||||
| Synonym(s) | Cryptozoic | |||||
| Usage information | ||||||
| Celestial body | Earth | |||||
| Regional usage | Global (ICS) | |||||
| Time scale(s) used | ICS Time Scale | |||||
| Definition | ||||||
| Chronological unit | Supereon | |||||
| Stratigraphic unit | Supereonthem | |||||
| Time span formality | Informal | |||||
| Lower boundary definition | Formation of the Earth | |||||
| Lower GSSA ratified | October 5, 2022 | |||||
| Upper boundary definition | Appearance of the Ichnofossil Treptichnus pedum | |||||
| Upper boundary GSSP | Fortune Head section, Newfoundland, Canada 47°04′34″N 55°49′52″W / 47.0762°N 55.8310°W | |||||
| Upper GSSP ratified | August 1992 (as base of Cambrian) | |||||
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