Geology of Hin Chang Si Sandstone Geoheritage in Khon Kaen Province for Geotourism Planning of Northeastern Thailand

One of the most distinguished sandstone geoheritage resources in Khorat Plateau is Hin Chang Si located Nam Phong National Park, Khon Kaen Province. The clastic sedimentary rocks Phra Wihan Formation Group covered this area. As a result lithologic study, consists pebbly sandstone, moderately sorted medium- to coarse-grained and small amount siltstone interbedded with laminated shale. characteristics (colors, cementation, degrees weathering) divided sandstones into two groups, including white grain-supported silica cement matrix-supported Fe-rich cement. In addition, these present primary structures, which comprise tabular cross-bedding normal grading as well bioturbation. demonstrates many geomorphological features, cliffs, potholes, rock pillars, polygonal cracks, caves, tafoni, runnels, natural arches according inventory. weathering degradation processes humid tropical conditions are main that caused features. Whereas factors affected various types morphology composed joints, folds, faults. national park provides trail map, tourism information, biodiversity data visitors; however, geological information about landforms should be actualized for geotourism development.