Rocks erupted in the field include alkali basalt, basalt, basanite, foidite, hawaiite, phonolite, tephriphonolite, trachyandesite, trachybasalt. Hyaloclastites are also found, as well as dolerites in the late Miocene rocks. Pumice has been reported from the Pleistocene-Holocene ages. The dominant rocks are basalts but trachyte is also found in maars and ignimbrites. Trachyte lava domes with heights of and diameters of are also found. Altered xenoliths are also found in the system. Pumice from the Udokan Plateau has been found in archeological sites.