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It spans from the formation of the Earth until approximately 541 million years ago and it accounts for approximately 90% of the Earth’s geologic history.

The biological period is called the Phanerozoic Eon and it is sub-divided into the Paleozoic era (meaning ancient life), the Mesozoic era (meaning middle life) and the Cenozoic era (meaning recent life)..

The concept of ‘Deep Time’ is synonymous with geologic time, a vast and somewhat mysterious period, which chronicles the life age of the Earth.

The Carboniferous was named for British coal beds called ‘coal measures’.

The Permian was named for Perm, Russia, using strata from the region defined by Scottish geologist Roderick Murchison.

These organizations standardize colors and time scales used on geologic maps.

These organizations have established international working groups to further refine the boundaries of the geologic time scale.

The arguments against adoption of the new epoch include that it’s more about pop culture than science; it’s also difficult to define an exact time when humans began affecting the rock strata (the definition of the beginning of an epoch), and humans have yet to significantly affect the earth’s geology.

Today, the geologic time scale is governed by the International Union of Geological Sciences (IUGS) and the International Commission of Stratigraphy.

This debate raged on until the latter half of the twentieth century when radiometric dating techniques were first developed.

Since that time, these techniques have provided generally accurate absolute dates for geologic strata and the age of the Earth.

Early on, there was no way to determine the actual age of earthen strata.

Young Earth creationists believed, based on biblical texts, that the Earth was only a few thousand years old, while others proposed much older ages.

Simply put, this principle states that fossils are found in very definite stratigraphic sequences.

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