The karst depression belongs to the accumulative area of surface water and subdrainage area of subsurface water, the karstification is relatively week, and reservoirs are undeveloped.
It's a residual mountain(unaka) which were a set of thrust blocks under the erosion unconformity.It's reservoir pore space is a fracture-vug-pore system of Ordovician carbonate karst.
Scientific investigations prove that the mountains here are of a limestone composition, and that the Yellow Dragon is actually a geological formation unique to a karst region.
Over millions of years, rivulets have carved into the stone, creating networks of caves, treacherous sinkholes, and imposing towers of rock called " karsts" .
Going further into what causes them, one recent study looking at a karst region in Spain found that sinkhole activity is intensified during drought periods.
Sinkholes can most notably be found in karst terrains, which is a term for places throughout the world whose features are largely influenced by underground drainage.