The nature of the breaches within the overburden and dissolution in the underlying limestone take on various dimensions. Subsidence of the overburden due to dissolution at depth forms sinkholes that create large discontinuities within the impermeable layer. Smaller discontinuities include faulting and fracturing within the overburden that provide conduits for water movement, which over time develop solution pipes. With continued water movement and karst development these features reach stages of maturity that may include infilling and/or reactivation. Buried subsidence and dissolution features may not have a surface expression since recent fluvial deposition post-dates subsidence activity. However, the subsurface features may still provide conduits for water movement to and from the aquifer and reactivation is a possibility.