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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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What is a period of earths history that lasted 245 to 208 million years ago?
The period of Earth's history that lasted 245 to 208 million years ago is the Triassic period. This period followed the Permian period and preceded the Jurassic period. It was a time of recovery and diversification of life after the mass extinction at the end of the Permian period.
What was the earliest epoch of the Jurassic period?
The Hettangian Epoch. The liassic epoch.
What's the vendian period?
The Vendian Period, also known as the Ediacaran Period, was the final geologic period of the Neoproterozoic Era before the Cambrian Period. It lasted from about 635 million to 541 million years ago and is known for the appearance of complex multicellular life forms, including the earliest known animals.
What gas has made up the largest portion of earths atmosphere for most of earths history?
Nitrogen has made up the largest portion of Earth's atmosphere for most of Earth's history. It currently makes up about 78% of the atmosphere.
What is a measuWhat is a measurement of the Earths history divided into time periodsrement of the Earths history divided into time periods?
The measurement of Earth's history divided into time periods is called the geological time scale. It is divided into eons, eras, periods, epochs, and ages, with each unit representing a significant change in Earth's geological and biological history.
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 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
What are two names for te earliest period of human history?
1. old stone age 2. paleolithic age
