precambrian times
The order of units of geologic time from longest to shortest is: eon, era, period, epoch.
Precambrian Era.
Eon, epoch, period, era
This period is called holocene.
Cenozoic is not a major period of the geologic time scale. The scale is broken down into eras. Cenozoic, Mesozoic and Paleozoic are all part of the Phanerozic era.
A period is smaller than an era in the geologic time scale. It is further subdivided into epochs and ages.
an era uhm NO ^ an eon . (apex)
The geologic time intervals from longest to shortest are eon, era, period, epoch, and age. This hierarchical sequence represents the largest divisions (eons) to the smallest subdivisions (ages) of Earth's history.
The geologic time scale is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. Phanerozoic eon is the most recent and divided into three eras: Paleozoic, Mesozoic, and Cenozoic. Each era is further divided into periods, epochs, and ages, with the ages being the shortest divisions of time on the geologic time scale.
geologic time scale
The two basic divisions following the Precambrian on the geologic time scale are the Paleozoic Era and the Mesozoic Era. These eras are further divided into periods, such as the Cambrian, Devonian, and Permian in the Paleozoic Era, and the Triassic, Jurassic, and Cretaceous in the Mesozoic Era.
The Proterozoic Eon, which lasted from about 2.5 billion to 541 million years ago, was the longest geologic time era. It was a time of significant biological and geological evolution, including the emergence of early multicellular life forms.