▁corresponds ▁to ▁the ▁Mill stone ▁G rit ▁Series ▁of ▁Great ▁Britain ) ▁and ▁succeeded ▁by ▁the ▁Ste phan ian ▁stage / age ▁( which ▁corresponds ▁to ▁the ▁upp erm ost ▁part ▁of ▁the ▁Co al ▁Me asures ▁of ▁Great ▁Britain ). ▁In ▁the ▁official ▁ge olog ic ▁times c ale ▁of ▁the ▁I CS , ▁the ▁West phal ian ▁is ▁placed ▁within ▁the ▁Pennsylvan ian ▁epo ch ▁( 3 1 8 - 2 9 9 ▁Ma ). ▁ ▁The ▁( region ally ▁defined ) ▁West phal ian ▁stage ▁corresponds ▁to ▁the ▁upper ▁part ▁of ▁the ▁( intern ation ally ▁used ) ▁Bash ki rian ▁stage ▁together ▁with ▁the ▁whole ▁of ▁the ▁Mos cov ian ▁and ▁Kas im ov ian ▁stages . ▁Fre quent ▁references ▁appear ▁in ▁scientific ▁literature ▁to ▁a ▁West phal ian ▁epo ch ▁or ▁West phal ian ▁series ▁reflect ing ▁the ▁stage ' s ▁earlier ▁status . ▁ ▁Life ▁Am ph ib ians ▁were ▁diverse ▁and ▁domin ated ▁communities . ▁The ▁collapse ▁of ▁the ▁rain for est ▁e col ogy ▁between ▁the ▁Mos cov ian ▁and ▁Kas im ov ian ▁removed ▁many ▁am ph ib ian ▁species ▁who ▁did ▁not ▁surv ive ▁as ▁well ▁in ▁the ▁cool er , ▁d rier ▁conditions . ▁Re pt iles , ▁however ▁prosper ed ▁due ▁to ▁specific ▁key ▁adapt ations ▁and ▁under w ent ▁a ▁major ▁evolution ary ▁radiation , ▁in ▁response ▁to ▁the ▁d rier ▁climate ▁that ▁proceeded ▁the ▁rain for est ▁collapse . ▁ ▁References ▁ ▁Category : Car bon ifer ous ▁ge