Diky Greben, seen here from the east along the Ozernaya River, is a Holocene lava-dome complex that formed in the center of the 20 x 25 km Pleistocene Pauzhetka volcano-tectonic depression. The initial eruptions of Diky Greben took place about 6000 years ago. Most of the volcano, particularly the thick lava flows north and south of Nepriyatnaya Mountain (left center horizon), which marks the 1070-m summit of the complex, were formed about 2000-1500 years ago. Photo by Oleg Dirksen, 1996 (Institute of Volcanology, Petropavlovsk).