▁March ▁ 2 0 0 7 , ▁Jane ▁was ▁nominated ▁as ▁one ▁of ▁Illinois ' ▁Seven ▁W onders . ▁ ▁The ▁Car bon ifer ous ▁Co al ▁Forest ▁A ▁two - story ▁tall ▁pre histor ic ▁coal ▁forest ▁is ▁created , ▁which ▁displays ▁local ▁landscape , ▁insect s ▁and ▁am ph ib ians ▁as ▁they ▁existed ▁ 3 0 0 ▁million ▁years ▁ago . ▁ ▁Fe aturing ▁life - size ▁rep lic as ▁of ▁giant ▁insect s ▁and ▁t et rap ods , ▁the ▁di or ama ▁acts ▁as ▁an ▁analog ue ▁to ▁the ▁M azon ▁Creek ▁foss il ▁b eds , ▁a ▁Car bon ifer ous - age ▁ge ological ▁L ager st ätten ▁in ▁central ▁Illinois , ▁responsible ▁for ▁the ▁pres ervation ▁of ▁most ▁of ▁the ▁area ' s ▁coal . ▁Chief ▁among ▁the ▁exhib it ' s ▁spec im ens ▁is ▁T ull imon str um ▁gre g arium , ▁the ▁Tul ly ▁Mon ster , ▁which ▁is ▁the ▁en ig m atic ▁state ▁foss il ▁of ▁Illinois . ▁ ▁The ▁Ord ov ician ▁Sea ▁An ▁exhib it ▁located ▁adjacent ▁to ▁the ▁front ▁des k ▁featuring ▁local ▁foss ils ▁from ▁the ▁Ord ov ician ▁Pl atte ville , ▁M if fl in , ▁and ▁Grand ▁Det our ▁Form ations , ▁as ▁well ▁as ▁a ▁di or ama ▁of ▁life ▁in ▁the ▁pre histor ic ▁Rock ford ; ▁an ▁exp ans ive ▁sea ▁and ▁cor al ▁margin ▁ 4 5 5 ▁million ▁years ▁in ▁the ▁making . ▁ ▁Ge os cience