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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.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".The end-Frasnian extinction was most pronounced in tropical environments, particularly in the reefs of the shallow seas.

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

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  1. Especially important are his History of Animals and other works where he showed naturalist leanings, and later more empirical works that focused on biological causation and the diversity of life.