They are divisions of geologic time, based largely on the fossil record of organisms. Eras are longer subdivisions of time which are further subdivided into periods and epochs. For instance, we are currently in the Holocene epoch of the Quaternary Period, and the larger Cenozoic Era.
Eon, Era, and Epoch: APEX :D
Eon --> Era --> sub-Era --> Period We are currently in: * Phanerozoic Eon * Cenozoic Era * Tertiary sub-Era * Quaternary Period
the mesoproterozoic was an era itself not a period.
It really wasn't an era. An Era was a much longer period of time. It was called the "Jurassic Period".
It was part of the Mesozoic Era.
It is the final period of the Mesozoic era.
The first period in the Paleozoic Era was the Cambrian.
The permian period was the end of the paleozoic era.
We are currently in the Quaternary Period of the Cenozoic Era.
Yes. The Mississippian period is a part of the Paleozoic era, along with the Cambrian, Ordovician, Silurian, Devonian, Pennsylvanian, and Permian periods.
jurassic
Ther Permian was the last period of the Paleozoic era.