g.s.springer:
Big karst spring in Ohio
g.s.springer:
Sump Spring Cave
g.s.springer:
Solution pipe: At least 12 feet deep
g.s.springer:
Open joint in streambed
g.s.springer:
Nice cold water
g.s.springer:
Dark line in stream is an open joint
g.s.springer:
Karst window or estevelle
g.s.springer:
Cool ice bulbs in creek
g.s.springer:
Cool ice bulbs in creek
g.s.springer:
Trace fossils in Silurian dolomite