Over thousands of years the cavity enlarges. Eventually the top of the cavity breeches. The limestone surface. Overlying clayey sediments slump in the cavity and a depression at the surface may precede collapse.
Catastrophic collapse of the cover sediments into the underlying cavity, forming a hole at the land surface. If the local water table is high the hole may fill with water.
Although sinkholes commonly form over points of increased bedrock dissolution, such as fracture intersections, they are not necessarily isolated events. The photo about was taken at the Haile quarry in Alachua County. It shows quite dramatically the extent and interconnected natural of dissolution cavities and pipes in some regions of Florida.
Although sinkholes commonly form over points of increased bedrock dissolution, such as fracture intersections, they are not necessarily isolated events. The photo about was taken at the Haile quarry in Alachua County. 
It shows quite dramatically the extent and interconnected natural of dissolution cavities and pipes in some regions of Florida.
