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Prehistoric Korea
The Prehistoric Korea is the era of human existence in the Korean Peninsula for which written records did not exist. It, however, constitutes the greatest segment of the Korean past and is the major object of study in the disciplines of archaeology, geology, and palaeontology.
==Geological prehistory==
Geological prehistory is the most ancient part of Korea's past. The oldest rocks in Korea date to the Precambrian. The Yeoncheon System corresponds to the Precambrian and is distributed around Seoul extending out to Yeoncheon-gun in a northeasterly direction. It is divided into upper and lower parts and is composed of biotite-quartz-feldspar schist, marble, lime-silicate, quartzite, graphite schist, mica-quartz-feldspar schist, mica schist, quartzite, augen gneiss, and garnet-bearing granitic gneiss. The Korean Peninsula had an active geological prehistory through the Mesozoic, when many mountain ranges were formed, and slowly became more stable in the Cenozoic. Major Mesozoic formations include the Gyeongsang Supergroup, a series of geological episodes in which biotite granites, shales, sandstones, conglomerates andesite, basalt, rhyolite, and tuff that were laid down over most of present-day Gyeongsang-do Province.
The remainder of this article describes the human prehistory of the Korean Peninsula.
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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