Pennsylvanian period
volume
British pronunciation/pˌɛnsɪlvˈeɪniən pˈiəɹɪəd/
American pronunciation/pˌɛnsɪlvˈeɪniən pˈiəɹɪəd/

"pennsylvanian period"的定义和意义

Pennsylvanian period
01

from 310 million to 280 million years ago; warm climate; swampy land

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