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Pennsylvanian period
/pˌɛnsɪlvˈeɪniən pˈiəɹɪəd/
/pˌɛnsɪlvˈeɪniən pˈiəɹɪəd/Pennsylvanian period
01
from 310 million to 280 million years ago; warm climate; swampy land
/pˌɛnsɪlvˈeɪniən pˈiəɹɪəd//pˌɛnsɪlvˈeɪniən pˈiəɹɪəd/
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