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writes of fine-grained greenish sandstones deposited in freshwater in which land plant fossils are well preserved."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".This was not adopted, but his division into Mississippian, for the 's "Story of a piece of coal" focuses on coal formation, but includes a section on the carboniferous limestone.It lists (but does not discuss) the intervening millstone grit."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.

About 375 million years ago, towards the end of a time interval called the Givetian.

It is suggested that analysis of sedimentary pyrite from the Belingwe sedimentary basin in Zimbabwe may provide evidence for bacterial reduction at this date.

2,500,000,000 to 542,000,000 years ago The Proterozoic Eon: the most recent part of the Precambrian Supereon.

The reference relates to Multicellular filaments from arctic Canada identified as a red algae Bangiomorpha pubescens. The curtain rises on a drama in the sea that has already begun, and has been going on for some time". London, Published by James Reynolds 174 Strand, 20t.10.1849. The first of these began about 443 million years ago.

"In all but detail, this fossil is indistinguishable from modern Bangia" for the Ediacaran fossils to first appear, 655,000,000 years ago. This showed life beginning with the Silurian system, which it described as "a marine deposit of vast extent containing abundance of marine organic remains. Together, these extinctions may have removed about 85 percent of species of marine animals.

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