Fault Bend Fold Related Thrust Fault Waturanda Formation as Representative of Tectonic Compression as an Asset Geological Heritage of GNKK, Indonesia

The volcanic sandstone, well exposed in the Kenteng area, Sempor District, and Kebumen Regency, indicates strongly deformed and complex structural complications. The research area is in the middle of The Karangsambung - Karangbolong National Geopark. Unfortunately, the geological heritage at the research area has not yet become one of geosite at The Karangsambung - Karangbolong National Geopark. This location is interesting to study further. It can be the key to answering geological events related to the older rocks, which is pra-Tersier Luk Ulo Melange Complex or younger rocks. Several parts of volcanic sandstone in the research are associated with thrust fault zones and intensive folding structures accompanied by drag faults. Detailed observations and measurements of geological structural elements well preserved were conducted around the deformation zone. Identifying the type of structure, geometry, and kinematics supported by the interpretation of the damage zone using a drone. Synthesis of a primary and secondary show that the structure developed in this research area is categorized as a fold-thrust system with a fault bend fold type. Intensive deformation of the fault bend fold structure is estimated to involve the entire Waturanda Formation regionally. The geological heritage of the fault bend fold phenomena at the research area can be the basis for creating the master plan that integrates the visual structural morphology of the hills and other geosites, especially in the middle part of the Karangsambung - Karangbolong National Geopark area.