Geomorphologic Model of Gunungsewu Karst, Gunung Kidul Regency, Yogyakarta Special Territory, Indonesia: The Role of Lithologic Variation and Geologic Structure

Abstract

Gunungsewu is a karst terrain that shows unique geomorphologic phenomena. The area is mainly composed of limestone of Wonosari Formation. Interaction of tectonic, erosion, denudation, and deposition occurred since Miocene period brings about diversity of landforms that supporting the development of this area as a natural laboratory, specific interest, scientific and educational tourisms. In general the geomorphology of Gunungsewu can be classified into two groups of landforms, the first is positive relief and the second is negative relief. The positive relief includes hills of conical, dome, convex-cone, convex and ridge. The negative relief involves cave, shaft, doline, uvala, locva and polje. This diversity is influenced by variation of physical properties of rock composing the landforms, such as hardness, internal friction angle, and geologic structures including thickness and position of bedding plane as well as joint pattern.

Hydraulic interconnections study of Seropan-Ngreneng-Bribin underground rivers in Gunung Kidul karst area using tracer technique

“…Geological formation of study area is given in Figure 2. Geologically, Gunung Kidul is dominated by limestone from middle Miocene to Pliocene age (Kusumayudha et al, 2015). Because of this geologic structure of the region, availability of water for domestic, agriculture, and industrial uses at the surface of the ground are very limited.…”

Determinants of Food Expenditure and Household Income in Gunungkidul’s Karst Region

“…The Gunungsewu Karst is characterized by a terrain with carbonate materials that features hills with flat tops, formed through rapid erosion and denudation of the terrain in a humid tropical environment. Furthermore, according to reference [24], the hills have a sinoid to cone-shaped pattern. The geology of Gunungsewu Karst tells the story of tectonic events, erosion, denudation, and deposition processes that date back to the Miocene epoch [24].…”

“…Furthermore, according to reference [24], the hills have a sinoid to cone-shaped pattern. The geology of Gunungsewu Karst tells the story of tectonic events, erosion, denudation, and deposition processes that date back to the Miocene epoch [24].…”

The Early Holocene Vertebrate Faunas from Seropan Cave, Gunung Sewu, Yogyakarta, Indonesia

“…Physiographically, the Gunung Sewu area is part of the southern mountainous zone (van Bemmelen, 1949). The stratigraphy of Gunung Sewu, from old to young, comprises Semilir, Nglanggran, Sambipitu, Oyo, Wonosari, and Kepek Formations as well as locally developed terrarosa and alluvial deposits (Tjia, 2013;Kusumayudha et al, 2015;Pandita et al, 2016). The lithology of the cave is made up of reef limestones, partly in the form of calcilutite, calcarenite, and calcirudite.…”