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catastrophism
Catastrophism is the theory that the Earth has been affected in the past by sudden, short-lived, violent events, possibly worldwide in scope.〔
〕 This was in contrast to uniformitarianism (sometimes described as gradualism), in which slow incremental changes, such as erosion, created all the Earth's geological features. Uniformitarianism held that the present is the key to the past, and that all things continued as they were from the indefinite past. Since the early disputes, a more inclusive and integrated view of geologic events has developed, in which the scientific consensus accepts that there were some catastrophic events in the geologic past, but these were explicable as extreme examples of natural processes which can occur.
Catastrophism held that geological epochs had ended with violent and sudden natural catastrophes such as great floods and the rapid formation of major mountain chains. Plants and animals living in the parts of the world where such events occurred were killed off, being replaced abruptly by the new forms whose fossils defined the geological strata. Some catastrophists attempted to relate at least one such change to the Biblical account of Noah's flood.
The concept was first popularised by the early 19th-century French scientist Georges Cuvier, who proposed that new life forms had moved in from other areas after local floods, and avoided religious or metaphysical speculation in his scientific writings.〔〔
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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