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4,540,000,000 (4.54 billion) years ago Formation of planet Earth - Usher's date was ).Archeozoic: end of Azoic to 2,500,000,000 years ago: The era of the earliest living beings on earth.The end-Frasnian extinction (the largest) about 375 million years ago.The about 365 million years ago during the Famennian.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.All plants were responsible for the transformation, but Archaeopteris was important because it made up 90 percent of the forests during the last 15 million years when these changes accelerated" ..."It was the first plant to produce an extensive root system, so had a profound impact on soil chemistry".
"Among the most attractive of these" tree-fern once called Cyelopteris (Round-leaved Fern), re named Palasopteris Hibernicus (Primitive Irish Fern). It was the "monarch of the primeval forests" whose "graceful fronds bent over the clear waters of a lake".
All of the major animal groups of the Ordovician oceans survived, including trilobites, "When I view all beings not as special creations, but as the lineal descendants of some few beings which lived long before the first bed of the Silurian system was deposited, they seem to me to become ennobled.
Judging from the past we may safely infer that not one living species will transmit its unaltered likeness to distant futurity." (Charles Darwin) From primal swamp to speaking humans: Ernst Haeckel said (1903) that the Pithecoiden (monkey) theory of human evolution requires tracing our animal ancestors before monkeys.
372,200,000 to 358,900 years ago Famennian age of the separated by about 10 million years.
About 375 million years ago, towards the end of a time interval called the Givetian.
They said "the epithet carboniferous is of obvious application to this series".