Want this question answered?
Tertiary
On the geologic time scale, an era is longer than a period. There are 12 geologic eras in total and they are composed of geologic periods. For instance, the Mesozoic era is composed of the Triassic, Jurassic and Cretaceous periods.
Era
Most geologic periods are named for the location where rock formations were first found that contained fossils from that period, some others (e.g. Carboniferous) were named for materials associated with the fossils.
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
Tertiary
Geologic time consists of eons, eras, periods, epochs, and ages. These measure periods of billions or millions of years.
An era, in geologic terms, is a geological time period encompassing two or more geologic periods.
The Dinosaurs lived in 3 Geologic time periods-The Triassic, Jurassic, and Cretaceous. These 3 time periods where the three periods of the Mesozoic Era, which is also known as the Age of Reptiles.
On the geologic time scale, an era is longer than a period. There are 12 geologic eras in total and they are composed of geologic periods. For instance, the Mesozoic era is composed of the Triassic, Jurassic and Cretaceous periods.
Era
a
eras and periods
Eras are divided into periods.
By eons, eras, epochs, and periods.
a geologic time scale has eras, made up of periods, epochs, etc. hope this helps! :D
Era