(Redirected from Geologic era)A geologic 'era' is a subdivision of
geologic time that divides an
Eon into smaller buckets. The
Phanerozoic Eon is divided into three such timeframes: the
Paleozoic,
Mesozoic, and
Cenozoic represent the major stages in the macroscopic
fossil record. These eras are separated by catastrophic
extinction boundaries, the
P-T boundary between the Paleozoic and the Mesozoic and the
K-T boundary between the Mesozoic and the Cenozoic. There is evidence that catastrophic
meteorite impacts played a role in demarcating the differences between the eras.
The
Hadean,
Archean and
Proterozoic eons were as a whole formerly called the
Precambrian Era. This covered the four billion years of Earth history prior to the appearance of hard-shelled animals. More recently, however, those eons have been subdivided into eras of their own.
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