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Pennsylvanian 펜실베이니아기, Pennsylvanian (geology)The Pennsylvanian (also known as Upper Carboniferous or Late Carboniferous) is, in the ICS geologic timescale, the younger of two subperiods (or upper of two subsystems) of the Carboniferous Period. It lasted from roughly Ma (million years ago). As with most other geochronologic units, the rock b...출처 영어 위키백과
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