 A cinder cone formed an island at the northern end of Lake Suguta and was reached by humans, judging by the presence of obsidian artifacts; traces of human activity have also been encountered 

Wavecut terraces are found at the former shorelines of Lake Suguta, particularly at elevations of which is where the main shoreline of Lake Suguta and also its highstand is located.Volcanism occurred in the area of Lake Suguta when it existed, resulting in the formation of pillow lavas and phreatomagmatic activity, lava flows of Emuruangogolak volcano reached the lake on its southern margin 11,000 - 9,000 years before present, and a layer of tephra was deposited in parts of the lake 8,770 years before present.A number of cinder cones have been modified by Lake Suguta, and the increased availability of water allowed the onset of fumarolic activity at volcanoes today too dry to support fumaroles, such as on The Barrier where fumarole sinter was emplaced when Lake Suguta existed.