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Pond Collapse Sinkhole and Sparrow Creek Cave Spring
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bacteria Ball Mill Resurgence bedding plane bedrock Blue Spring Branch bluff Canyon Passage cave passage cave spring cave stream channel Cinque Hommes Creek Circle Drive Resurgence Clair County concrete pipe conduit system Doc White Spring Dry Run Branch Dye tracing entrance Falling Spring field trip Figure flowstone Fountain Creek fracture Genevieve Limestone Geological groundwater basins groundwater flow heavy rainfall Heberlie Resurgence hydrogeology Illinois Caverns Jerry Lawrence Sink Joachim Dolomite karst development karst features karst resurgences karst terrain karst window km of mapped L/sec land surface Louis Limestone mapped passages Mertz Cave Mertz Resurgence Mississippi River Missouri Monroe County Ordovician overflow outlets Panno Perry County Perryville karst area Perryville sinkhole plain Peter Sandstone private septic systems recharge Run Branch Estavelle runoff shallow karst aquifer small cave solution-enlarged southeastern Missouri southwestern Illinois Sparrow Creek Cave Stemler Cave storm-water drainage Streiler City Cave tufa Turn right east upstream Vandike water entering Weibel