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) 13,800,000,000 (13.8 billion) years ago The creation of the universe according to present estimates of "big bang" - "Stephen Hawkings and others...

estimate between 18 and 11 billion with 13.8 being the closest estimation".

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Three strata of toadstone had been found, and the limestone under the third was as far as miners had reached. The map project describes the "shallow tropical sea surrounded by coral reefs" in which the limestones were laid down and how "subterranean volcanoes erupted spasmodically through the sea floor, covering the limestones with ash and lava" which formed the toadstone.

is Galena (lead sulfide) formed as pockets or veins in carbonate rock into which the mineral bearing fluid rock has intruded.

He began to do this in 1866 in the General Morphology. about 419,2000,000 to 393,300,000 years ago Early Devonian The vegetation of the early Devonian consisted primarily of small plants, the tallest being only a meter tall.

By the end of the Devonian, "The earth's atmosphere was changing rapidly, going from perhaps 10 percent to 1 percent CO2 and from about 5 percent to 20 percent oxygen over a 50- million year period in the (late) Devonian period.

4,540,000,000 (4.54 billion) years ago Formation of planet Earth - Usher's date was ).

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