Eras are longer than, and made up of, periods, in the same way that decades are longer than and made up of years. For example, the Mesozoic era is made up of the Triassic, Jurassic and Cretaceous periods, in the same way that the 1990s is made up of 1990, 1991, 1992, 1993... etc.
eras and periods
periods make up eras
Geological eras can be divided into periods, epochs and ages.
Geological eras can be divided into periods, epochs and ages.
Eons are divided into eras, which are further divided into periods. Each period is then subdivided into epochs.
Periods mean eras centuries ages
The Geological eras can be divided into three major eras: Paleozoic, Mesozoic, and Cenozoic. These eras represent different periods in the Earth's history marked by significant geological and biological changes. Each era is further subdivided into periods, epochs, and ages.
By eons, eras, epochs, and periods.
An eon is an indefinitely long period of time, in which there exist noteworthy periods known as eras.
By eons, eras, epochs, and periods.
farts
Eras are based one the worldwide changes in types of fossils. Periods are based on types of life worldwide. The Cenozoic era is the geological time scale is divided into both periods and epoch.