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The answer is debated amongst geologists, astrologists and palaeontologists - the earliest period in life's history is the Archean eon, when the first proto-cells were thought to have formed. The earliest period there, is the Eoarchean - 4200 - 4400 million years ago. However, the earliest eon is the Hadean, which encompasses the formation of the Earth as celestial body 4600 million years ago, up to 4200 million years ago. The earth was formed by accretion (gravitational attraction of smaller bodies, to form a central object of greater mass, thus attracting more smaller bodies, and so on), within 10 - 20 million years, so, other than describing this period of Earth's history as 'Proto-Earth', there isn't really a way of classifying even earlier stages, unless you are willing to look into the stages of accretion in forming planets. (The earliest stage would probably be a 'proto-planetary disk' stage, which was itself formed as a by-product of the formation of the sun, followed by a kilometre-wide planetisimal, and then a Mars sized 'embryo', growing progressively. In this sense, the Earth and the Sun are descended from the same Giant Molecular Cloud, or GMC.)
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∙ 11y ago
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∙ 9y agothe jurassic
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What is a period of earths history that lasted 245 to 208 million years ago?
The Triassic
Why pieces of earth's earliest crust do not exist today?
why do pieces of earths earliest crust not exist today
What gas has made up the largest portion of earths atmosphere for most of earths history?
Nitrogen
What is used to measure earths history?
History can not be measured it can only be recorded, studied or experienced.
What was the earliest epoch of the Jurassic period?
The Hettangian Epoch. The liassic epoch.
Which period was the earliest period?
The first period of human life is called pre-history
What has the author John William Abbott written?
John William Abbott has written: 'A history of London, from the earliest period to the present time' -- subject(s): History 'A history of London from the earliest period'
When was devonians time period in earths history?
The Devonian Period was from 416 MYA - 360 MYA.
What was earths atmosphere oceans and continents began to form during a period of earths history called?
precambrian era
What geologic period lasted seven eighths of the earths history?
The Precambrian time
What time period represents 88 percent of earths history?
The Precambrian Time
According to its name the archaeozoic era of earths history was characterized by what type of life form?
unicellular organisms are earliest forms of life
What is a period of earths history that lasted 245 to 208 million years ago?
The Triassic
What has the author John Goding written?
John Goding has written: 'A history of Cheltenham from the earliest period'
What is a measurement of the earths history divided into time period?
fossil record geologic time scale
What has the author W Knighton written?
W. Knighton has written: 'The history of Ceylon from the earliest period to the present time' -- subject(s): History
Legendary period whose tales formed a bridge between China's earliest recorded history?
golden age
