Carbonate and siliciclastic sedimentary rocks where in the lower part, there are conglomerate deposits of various materials with sedimentary structures in the form of crossing and channel lenses as fluvial river deposits. Furthermore, the rocks at the site are dominated by the presence of reef limestone and clastic limestone (calcarenite-chalcopyrite). The main fragments of clastic limestone are bioclasts, fossil fragments, and some igneous lithics.
The morphology of the coastal cliffs is steep with a height of up to 100m. In addition, coastal terraces also develop and considering the condition of fossils that are still young, namely Quaternary age, the rocks at this location have experienced significant uplift.