A system of chronological dating, which classifies stratigraphy in time (geological strata) of time is called as the geological time scale (GTS). The time scale was created by the study of layers of physical rock and relationships and also the times when various organisms appeared, evolved, and vanished through the study of fossil remains and traces.
The main interval units where geologic time is divided are called eons. Eons are of four types, 1) Hadean Eon 2) Archean Eon 3) Proterozoic Eon 4) Phanerozoic Eon Hadean Eon, Archean Eon, and Proterozoic Eon are together known as Precambrian supereon. Eons are further divided into Eras. Eras are further divided into periods, epochs, and ages.
The word Hadean is derived from the Greek word â€œHadesâ€, which means the Greek god of the underworld.
Hadean eon is the first time on.
It lasted from 4,600 million years to 3,900 million years ago.
The eon started with the formation of the earth, the moon, and many radioactive elements were short-lived and the Earth experienced collisions often with other bodies of the solar system.
There was no rock record from this eon on the earth, but in 3.96 billion years, some old rocks were found in Northwest Territories in Canada.
The deposition of rocks in other planets of the Solar system possibility happened in this eon.
The earliest forms of life known on the Earth were identified in the dating of rocks from Archean Eon.
This eon lasted from 3,900 million years and 2,500 million years ago.
The oldest rocks that were present on earth were deposited during this eon.
This eon was also known as the Archaeozoic eon.
During this eon, the sedimentary rocks that were deposited in the oceans were found to contain microscopic organisms, which had the characteristic of bacteria.
Colonies of cyanobacteria, photosynthesizing bacteria formed layered rocks structure known as stromatolites. Stromatolites were found in shallow water.
In this eon, the atmosphere of the earth was found to have gases that were not breathable by a living organism found in the present. Some gases include methane, hydrogen, carbon dioxide, and ammonia.
Oxygen was released into the atmosphere by colonies of photosynthesizing cyanobacteria.
In the Archean eon, the climate and weather were extremely hot and wet. Oceans were warm.
Volcanic ash and dust were liberated into the atmosphere by volcanic eruptions. This led to violent storms and rains.
It lasted from 2,500 million years and 540 million years ago.
During this eon, rocks that were deposited comprised of a multicellular organism.
The oceans in the Proterozoic eon had stromatolites present in shallow water.
In the late Proterozoic eon, an organism that contains a nucleus called eukaryotes occurred and they were ancestors of living things in the present.
The accumulation of oxygen in the atmosphere caused the bacteria of the Archean Eon to diminish. This was considered as one of the first extinction that took place in this eon.
Two ice ages were experienced in the Proterozoic eon.
The current eon is the Phanerozoic eon and it started 540 million years ago.
The rocks that were deposited during this eon, shows the presence of fossilized body parts (hard in nature) of the current living things.
In this eon, there was a sudden occurrence of phyla, growth in complex plants, the appearance of fish, the occurrence of tetra pod, and insects.
On land, the appearance of the plant started during the early period of this eon.
Phanerozoic Eon is subdivided into three eras namely 1) Paleozoic Era 2) Mesozoic Era 3) Cenozoic Era
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