▁r ift ▁leads ▁directly ▁onto ▁a ▁ ▁pitch ▁which ▁lands ▁in ▁a ▁tall ▁f iss ure ▁passage . ▁To ▁the ▁west , ▁the ▁passage ▁termin ates ▁in ▁a ▁large ▁chamber ▁and ▁a ▁mud ▁cho ke . ▁To ▁the ▁east ▁the ▁passage ▁div ides , ▁with ▁one ▁branch ▁heading ▁towards ▁E ye hol es ▁before ▁becoming ▁too ▁tight , ▁and ▁the ▁other ▁passing ▁through ▁a ▁d ug - out ▁con str iction ▁into ▁a ▁mud dy ▁craw l ▁that ▁finish es ▁on ▁a ▁led ge ▁ ▁above ▁the ▁floor ▁of ▁the ▁Death ' s ▁Head ▁Main ▁Chamber , ▁opposite ▁East ▁Pass age . ▁ ▁Ge ology ▁and ▁hydro log y ▁ ▁The ▁cave ▁is ▁a ▁solution al ▁cave ▁formed ▁in ▁V ise an ▁Great ▁Sc ar ▁lim estone ▁from ▁the ▁Mississ ipp ian ▁Series ▁of ▁the ▁Car bon ifer ous ▁period . ▁Its ▁development ▁has ▁been ▁largely ▁determined ▁by ▁the ▁same ▁vertical ▁fault ▁encountered ▁in ▁R umb ling ▁H ole ▁and ▁Big ▁Me anie . ▁The ▁stream ▁which ▁flows ▁through ▁the ▁cave ▁origin ates ▁from ▁Long ▁Drop ▁C ave , ▁and ▁flows ▁through ▁to ▁Lost ▁Joh ns ' ▁C ave ▁as ▁a ▁trib ut ary , ▁to ▁eventually ▁emer ge ▁from ▁the ▁Le ck ▁Beck ▁Head ▁spring ▁in ▁E ase ▁Gill . ▁It ▁is ▁thought ▁that ▁what ▁is ▁now ▁the ▁main ▁cave ▁is ▁relatively ▁recent , ▁and ▁that ▁some ▁ 3 5 0 , 0 0 0 ▁years ▁ago ▁water ▁s inking ▁at ▁R umb ling ▁H ole ▁followed ▁a ▁ph re atic ▁tr