Situs Warisan Geologi
Pantai Sembukan
Pantai terjal Sembukan yang berpanorama indah disusun oleh batugamping Formasi Wonosari. Di bagian bawah runtunan batugamping tersingkap batupasir gampingan Formasi Oyo. Lereng terjal yang membatasi daratan dan laut adalah gawir sesar turun berarah hampir barat-timur. Blok bagian selatan yang merupakan hanging-wall amblas masuk ke dalam laut yang dalam.
The steep beach with beautiful panoramic views is composed of limestone from the Wonosari Formation. At the bottom of the limestone cliffs, the Oyo Formation calcareous sandstones are exposed. The steep slope that separates land and sea is a downward fault escarpment trending almost west-east. The southern block which is the hanging-wall collapsed into the deep sea.
Pengangkatan menyingkapkan endapan-gisik, yang disusun oleh pasir putih berbutir kasar dan konglomerat yang belum membatu secara sempurna. Bongkahan besar koral yang tertanam di dalam endapan-gisik diangkut oleh gelombang besar dari asalnya di dasar laut lepas pantai. Endapan-gisik ini berada sekitar 50 cm di atas muka laut rata-rata, dan diduga baru berumur ratusan tahun. Kekar-kekar yang memotong endapan menunjukkan masih aktifnya fenomena pengangkatan tektonik di pantai selatan Gunung Sewu.
Uplifting reveals silt, which is composed of coarse-grained white sand and conglomerates that have not been completely petrified. Large chunks of coral embedded in sediments are transported by large waves from their origins on the seabed offshore. These deposits are located about 50 cm above mean sea level, and are thought to be hundreds of years old. The joints that cut through the sediments show that the phenomenon of tectonic uplift is still active on the south coast of Mount Sewu.