| Abstrak/Abstract |
The Gunung Kidul karst is the western part (65%) of the larger Gunung Sewu (Thousand Hills) karst
area, which is generally considered a type example of cone- or kegelkarst (Lehmann, 1936). This classification
is an over-simplification, however, in that the karst landscape within the Gunung Sewu is considerably
differentiated in terms of landform morphology and genesis. In the Gunung Kidul, this differentiation
is evident from aerial photographs, which provide basic information about landform patterns,
including lineament information. These observations were confirmed by field investigation, which incorporated
landform measurement and acquisition of lithological information. These detailed studies distinguish
three Gunung Kidul karst subtypes: labyrinth-cone, polygonal, and residual cone karst. The
labyrinth-cone subtype occurs in the central Gunung Kidul karst where hard, thick limestones have
undergone intensive deformation. Polygonal karst has developed in the western perimeter on hard but
thinner limestone beds. The residual cone subtype occurs in the weaker and more porous limestones
(wackestones or chalks), despite considerable bed thickness. |
