Same as other mountains in Okuhira, Mt. Bunagatake is in middle-paleozoic strata and is an outcrop which is composed of sedimentary rocks such as sandstones, mudstones and so on.
武奈ヶ岳は、奥比良の他の山岳同様、中古生層にあり、砂岩や泥岩等の堆積岩により形成された露頭である。