formation of 'cockpit country'

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Cockpits are formed in humid tropical karst regions where simple closed depressions which have convexly inward lobed sides,making them star shaped,with gullies carrying streams after heavy rains are found.They are set among steep residual hills.
                       Lehmann  gave an interpretation of the development of humid tropical karst evolution i.e., development of the 'cockpit country'.A prior planation is gently domed, tectonically which rejuvenated surface drainage,which produced ridges and valleys which align down the flank of the dome.This is followed by the development of vertical infiltration and underground drainage causing valleys to breakup into chains of star shaped closed depressions of surface solutional origin.thus,there is centripetal fluvial action supported by rainstorms of high intensity(eg.-New Guinea .The typical craggy slopes are covered with microgenic soils which is variable and accentuated by slash and burn gardening or farming technique or other types of agriculture.the favorable factors are:-
1)Low primary porosity;
2)Great compaction;
3)widely spaced planes of weakness;
4)Great karst depth;
5)Subjacant development beneath superficial deposit.

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