No less than 150 Geological Engineering students from the 2023 batch have filled the yard of the Pertamina Sukowati Building (GPS) on Sunday morning, November 24, 2024. They are preparing to conduct a field trip for the Field Geology Methods (MGL) and Structural Geology courses. The locations to be visited are the Bayat Area, Klaten Regency and its surroundings which have been known as one of the geological laboratory areas. There are two locations to be visited, the first location is the outcrop resulting from excavation activities on the west side of Mount Cakaran, West Jiwo Hills. While the second location is in Dk. Jentir, Sambirejo Village on the border of Cawas District and Ngawen District, Gunungkidul which is also the location of a former community mining excavation.
In this field trip, the students were accompanied by approximately 14 laboratory assistants and a team of lecturers consisting of Mr. Najib, S.T., M.Eng., Ph.D; and Mr. Wahyu Budi Khorniawan, S.T., M.T. from the Field Geology Methods lecturer team and Mr. Fahrudin, S.T., M.T., Ph.D, and Mr. Bagaskara Wahyu Purnomo Putra, S.T., M.Eng from the Structural Geology team. At the first location on Mount Cakaran, West Jiwo Hills, students were invited to see the diversity of rocks on one outcrop. Where at this location, intrusive igneous rocks, sedimentary rocks, and metamorphic rocks can be observed at the same time. In addition to the diversity of rocks, at this first location, students can also find extensional fractures and examples of ductile structures, namely foliation in phyllite rocks.
Students’ enthusiasm on the fieldtrip of Structural Geology and Field Geology Method subjects
After lunch accompanied by light rain, the group arrived at the second location in Dk. Jentir. At this location, students focused on observing the components of the geological structure. At the second location, students were invited to measure strike/dip and measure fault planes which they would later analyze using a rose-net diagram. In addition to geological structures, at this location, various sedimentary structures and Angular unconformity boundaries can be found. In terms of lithology, the outcrops at this second location consist of dominant layers of sandstone and claystone with the lower part of the normal graded breccia layer part of the Butak Formation (Omb) with the uppermost part being layered limestone from the Temas Member of the Wonosari Formation (Nmwt) according to the Wonosari Sheet Geological Map by Barianto, et al. (2017).
After this field trip, it is hoped that fellow students will be increasingly able to implement what they have learned in lectures and practicums on Field Geological Methods and Structural Geology. So that in the future they will be much more prepared to be able to collect field data properly and in a structured manner considering that the 2023 Geological Engineering students are the class that will soon carry out field mapping activities in the following year.
