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The Carboniferous (// KAR-bə-NIF-ər-əs) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period 358.9 million years ago (mya), to the beginning of the Permian Period, 298.9 mya. The name Carboniferous means "coal-bearing", from the Latin carbō ("coal") and ferō ("bear, carry"), and refers to the many coal beds formed globally during that time.
|358.9 ± 0.4 – 298.9 ± 0.15 Ma|
|Nickname(s)||Age of Amphibians|
|Regional usage||Global (ICS)|
|Time scale(s) used||ICS Time Scale|
|First proposed by||William Daniel Conybeare and William Phillips, 1822|
|Time span formality||Formal|
|Lower boundary definition||FAD of the Conodont Siphonodella sulcata (discovered to have biostratigraphic issues as of 2006)|
|Lower boundary GSSP||La Serre, Montagne Noire, France|
|Lower GSSP ratified||1990|
|Upper boundary definition||FAD of the Conodont Streptognathodus isolatus within the morphotype Streptognathodus wabaunsensis chronocline|
|Upper boundary GSSP||Aidaralash, Ural Mountains, Kazakhstan|
|Upper GSSP ratified||1996|
|Atmospheric and climatic data|
|Sea level above present day||Falling from 120 m to present-day level throughout the Mississippian, then rising steadily to about 80 m at end of period|
The first of the modern 'system' names, it was coined by geologists William Conybeare and William Phillips in 1822, based on a study of the British rock succession. The Carboniferous is often treated in North America as two geological periods, the earlier Mississippian and the later Pennsylvanian.
Terrestrial animal life was well established by the Carboniferous Period. Tetrapods (four limbed vertebrates), which had originated from lobe-finned fish during the preceding Devonian, became pentadactylous in and diversified during the Carboniferous, including early amphibian lineages such as temnospondyls, with the first appearance of amniotes, including synapsids (the group to which modern mammals belong) and reptiles during the late Carboniferous. The period is sometimes called the Age of Amphibians, during which amphibians became dominant land vertebrates and diversified into many forms including lizard-like, snake-like, and crocodile-like.
Insects underwent a major radiation during the late Carboniferous. Vast swaths of forest covered the land, which eventually fell and became the coal beds characteristic of the Carboniferous stratigraphy evident today.
The later half of the period experienced glaciations, low sea level, and mountain building as the continents collided to form Pangaea. A minor marine and terrestrial extinction event, the Carboniferous rainforest collapse, occurred at the end of the period, caused by climate change.
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