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"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 reference relates to sulphate and iron reduction as early forms of microbial respiration.

William Daniel Conybeare and William Phillips (1822, page vii) proposed to consider all rocks in an ascending order with a group including "not only the great coal-deposit itself, but those of the limestone and sandstone also on which it reposes" as the "medial" [middle] order.

They said "the epithet carboniferous is of obvious application to this series".

Henry Shaler Williams (1891) proposed Pennine System as the name for the Carboniferous.

The end-Frasnian extinction (the largest) about 375 million years ago.

The about 365 million years ago during the Famennian.

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