88 percent of geologic time is represented by the Precambrian time span.
An Eon.
The geologic time scale that represents the longest time span is the eon. It is a unit of time that is equal to a billion years.
A geosyncline is a part of the earth's crust that is prone to downward warping during a long span of geologic time. It is a large depression that contains very thick deposits.
because the time span of earth past is so great geologic
The oldest division of geologic time is the Precambrian, specifically the Archaean Eon from which the oldest rocks and fossils date. (The Hadean Eon preceded the Archaean, but no geologic records date from this time because the Earth was cooling from a molten state.)
PrecambrianThis period is also split into two Eons: Archean (from 2.5 billion to 4.5 billion years ago) and Proterozoic (from 542 million to 2.5 billion years ago).
An Eon.
an era is a very long span of geologic time
Era
because the time span of earth past is so great geologic
4.6 billion years
4.6 billion years
Humans span roughly 0.0044% (about 4 thousandths of one precent) of the time since the Earth was formed.
4.6 billion years
Erosion of already deposited layers or a time span of non-deposition.
The longest in geological time is an Eon eg. Archeozoic Eon . Edit: there is also the supereon, which is usually composed of 2-3 eons.
Probably it is dung that is a fossil