Geological Time Scale

The geological time scale represents the geological history of the Earth from its origins to the present day. Geologists have used significant events in Earth's history to break Earth's history into time intervals. As a result, the time slots are not the same length. The current geological chronology is based on radioactive dating and paleontological records of ancient life preserved in rock formations. Layer boundaries mostly coincide with periodic extinctions and the emergence of new species. Thus, a geological timeline shows the subdivisions of strata (rocks) and the corresponding time intervals during which strata (rocks) were formed.

The longest geological time is eons, hundreds of millions of years. Aeons are subdivided into smaller time intervals known as epochs, and epochs are subdivided into periods. A smaller subdivision of a period is an epoch, each containing a different epoch of rock formations or events.

Corresponding stratigraphic subdivisions of an epoch are groups of systems. The system has multiple series, each series has multiple entities.

With a history of about 4.6 billion years, the Earth is divided into two eons. Lifeless and lifeless Cryptozoic eons have discovered Phanerozoic eons. Cryptose is subdivided into Archaean and Proterozoic (Precambrian). The modern age consists of three epochs: the

Paleozoic, Mesozoic, and Cenozoic. The various periods are:

Paleozoic - Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian

Mesozoic - Triassic, Jurassic, Cretaceous,

Cenozoic – Tertiary (Paleocene, Eocene, Oligocene, Miocene, Pliocene),

Quaternary (Pleistocene, Holocene).