- published: 09 Feb 2015
- views: 2053
The Archean Eon (/ɑːrˈkiːən/, also spelled Archaean) is a geologic eon, 4,000 to 2,500 million years ago, following the Hadean Eon and preceding the Proterozoic Eon. During the Archean, the earth's crust and layers had just formed, making the Earth much cooler than it was during the Hadean and allowing the formation of continents.
Instead of being based on stratigraphy, the beginning and end of the Archean are defined chronometrically. The lower boundary (starting point) of 4 billion years is officially recognized by the International Commission on Stratigraphy.
The Archean customarily starts at 4 Ga—at the end of the Hadean Eon. In older literature, the Hadean is included as part of the Archean. The name comes from the ancient Greek Αρχή (Arkhē), meaning "beginning, origin".
The Archean is one of the four principal eons of Earth history. When the Archean began, the Earth's heat flow was nearly three times as high as it is today, and it was still twice the current level at the transition from the Archean to the Proterozoic (2,500 million years ago). The extra heat was the result of a mix of remnant heat from planetary accretion, heat from the formation of the Earth's core, and heat produced by radioactive elements.
Episode 1 of the Early Earth series, this video features Dr. Russell Shapiro (California State University, Chico) in the wind River Range, WY, discussing the geology of early Earth, dated to ~2.1 Billion years ago. ------------------------------------------ Produced: Russell Shapiro and John Spear Directed, filmed, and edited by Dave Vuono ------------------------------------------ Music: This video features the song “A Stranger's Map of Texas” by Michael Chapman and The Woodpiles, available under a Creative Commons Attribution-Noncommercial license.
I discuss the chemical evolution of the early atmosphere of Earth, Methanogen Earth, the Ur continents, and the gradual increase in atmospheric oxygen, culminating in the Cambrian Explosion.
What if Doc and Marty never actually stopped Biff in Back to the Future Part 2? What if another adventure occurred that was off course from the grand plot. In our adventure, Marty and Doc travels accidentally to the Archean Eon! Can Doc and Marty understand where they are and get the Delorean fixed before they run out of oxygen? Find out in Back to the Future: Archean Times
This is what is coming for you - for you, the guilty. / My wrath is a red horse, whose rider takes peace by sword. / Then too a green horse, whose rider is named Death. / They trample the earth with justice and authority. / And all the guilty will scream and weep and try to flee from bears, warts, wolves, and wars. / My wrath is the quake that will blacken the sky. / Rich, poor, and everyone will try to hide. / In broken mountains, they’ll seek cover, lest they die. / For, of this day, who is able to survive? / Fire and blood will be thrown to the earth. / Empty trees, so tall, will be burned. / The mountain of fire will sink below water. / The star Bitterness will bow down to the Father. / Trumpets sound, and the bottomless pit will open up / and the furnace will spit smoke out of which l...
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the name of the music in the video is: 心游太玄, Spirit Travle In Archean. http://www.wudangdao.com/
Archean Soundtrack's first official music video for their latest single Reach. http://www.facebook.com/archeansoundtrack
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