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Late Jurassic : ウィキペディア英語版
Late Jurassic

The Late Jurassic is the third epoch of the Jurassic period, and it spans the geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago (Ma), which is preserved in Upper Jurassic strata.〔Owen 1987.〕 In European lithostratigraphy, the name "malm" indicates rocks of Late Jurassic age. In the past, this name was also used to indicate the unit of geological time, but this usage is now discouraged to make a clear distinction between lithostratigraphic and geochronologic/chronostratigraphic units.
==Subdivisions==
The Late Jurassic is divided into three ages, which correspond with the three (faunal) stages of Upper Jurassic rock:

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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