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The end-Frasnian extinction was most pronounced in tropical environments, particularly in the reefs of the shallow seas.Reef building sponges called stromatoporoids and corals suffered losses and stromatoporoids finally disappeared in the third extinction near the end of the Devonian.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.

"It was the first plant to produce an extensive root system, so had a profound impact on soil chemistry".

"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.

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

The about 365 million years ago during the Famennian.

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