Sunday, March 9, 2014

Tuesday, February 25, 2014

Discovery, Oldest Earth Crust

Behind the blue facade of this Zircon crystal discovered in Western Australia. It is actually a piece of the first crust of the Earth's which helps explains and show the formation of the first habitual environments on Earth. Prof. John Valley University of Wisconsin, Madison. Geochronology has confirmed that the Jack Hills Zircon confirms that the Earth's crust formed at least 4.4 billion years ago--Hadean 4-4.5, Archean 3.5-4 billion years. That is just 160 million years after the solar system was formed. By measuring lead inside of Zircon it can be determined and assumed that 100% of that lead had to form by radioactive decay-that's how to calculate the age. The professor has come to the conclusion that during this time Earth was not as harsh of a place as scientists have usually thought