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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.
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" ...
Archeozoic: end of Azoic to 2,500,000,000 years ago: The era of the earliest living beings on earth.
"More than 3.5 billion years ago, small single-celled organisms acquired the capacity to photosynthesize" "Plants were restricted to the aquatic world until three billion years later, the first uncontroversial evidence for life is found 2,700,000,000 years ago.
The veins of metallic ores appeared in the limestone.
4,540,000,000 (4.54 billion) years ago Formation of planet Earth - Usher's date was ).2,500,000,000 to 542,000,000 years ago The Proterozoic Eon: the most recent part of the Precambrian Supereon.starting about 2.500,000,000 years ago, sedimentary rocks affected by higher amounts of oxygen in the atmosphere, appear red, as though rusted. Fossils include earliest fish, but of types very different from modern ones. signs of the "tentative presence" of plants on land.The reference relates to sulphate and iron reduction as early forms of microbial respiration.It is suggested that analysis of sedimentary pyrite from the Belingwe sedimentary basin in Zimbabwe may provide evidence for bacterial reduction at this date.
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"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".