0 0 ▁million ▁years ▁ago . ▁Lar ge ▁foss il ▁t et rap od ▁ass embl ages ▁are ▁known ▁from ▁the ▁Art in sk ian ▁stage ▁of ▁the ▁Early ▁Perm ian ▁about ▁ 2 7 5 ▁million ▁years ▁ago ▁and ▁contain ▁no ▁l iss am ph ib ians , ▁suggesting ▁that ▁the ▁Early ▁Perm ian ▁may ▁be ▁an ▁upper ▁bound ▁for ▁the ▁age ▁of ▁Bat rach ia . ▁ ▁References ▁ ▁Category : Am ph ib ians ▁Category : Ext ant ▁Early ▁Tri ass ic ▁first ▁appearances ▁Category : T ax a ▁named ▁by ▁Pierre ▁André ▁L atre ille <0x0A> </s> ▁Central ▁Du Page ▁Hospital ▁( CD H ) ▁is ▁a ▁ 3 9 0 - bed ▁hospital ▁in ▁Win field , ▁Illinois . ▁It ▁is ▁one ▁of ▁seven ▁hosp it als ▁operated ▁by ▁North western ▁Medicine . ▁CD H ▁became ▁one ▁of ▁the ▁first ▁hosp it als ▁in ▁the ▁Chicago ▁area ▁to ▁perform ▁open - heart ▁surg ery ▁on ▁a ▁be ating ▁heart , ▁and ▁is ▁ranked ▁ 5 th ▁among ▁Illinois ▁hosp it als ▁in ▁the ▁current ▁ranking ▁by ▁ 2 0 1 7 - 1 8 ▁U . S . ▁News ▁Best ▁H osp it als ▁Honor ▁Roll . ▁ ▁History ▁The ▁Central ▁Du Page ▁Hospital ▁Association ▁was ▁established ▁in ▁ 1 9 5 8 ▁when ▁citizens ▁from ▁Glen ▁El lyn , ▁Lomb ard , ▁Whe aton , ▁Warren ville , ▁Win field ▁and ▁West ▁Chicago ▁band ed ▁together ▁to ▁restore ▁a ▁san it arium ▁located ▁on ▁the ▁hospital '