In order of longest to shortest, what are the four basic units that make up the geologic time scale?.

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Answer 1

It might look like the geologic time scale is to geoscientists what the periodic table of elements is to chemists. The geologic time scale is divided into (from longest to shortest): eons, eras, periods, epochs, and ages.

Earth's history is characterized by four eons; in order from oldest to youthful, these are the Hadeon, Archean, Proterozoic, and phanerozoic. Eons are the largest intervals of geologic time and are hundreds of millions of times in duration. In the time scale above you can see the Phanerozoic Eon is the most recent on and began further than 500 million times agone

. Eons are divided into lower time intervals known as years.The great Precambrian breadth of time is divided into the Proterozoic, Archean, and Hadean eons in order of adding age. The names of the ages in the Phanerozoic eon( the eon of visible life) are the Cenozoic(" recent life"), Mesozoic(" middle life"), and Paleozoic(" ancient life").

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