The late-Quaternary Icelandic-type shield volcano Bolshoi Payalpan is located north of massive Ichinsky volcano in the southern Sredinny Range. Bolshoi Payalpan (Big Payalpan) volcano is of dominantly basaltic andesite to andesitic composition and is overlain by a late-Pleistocene to possible Holocene age basaltic cinder cones. The Pleistocene Payalpan shield volcano is located immediately SW of Bolshoi Payalpan, and itself has several lava flows of possible Holocene age that descend its NW and SE flanks. Early geologic studies in the Sredinny Range (Ogorodov et al., 1972) identified numerous Holocene eruptive centers based primarily on morphological criteria. However, later work has suggested that Sredinny Range volcanoes are less mantled by Holocene tephras than eastern Kamchatka volcanoes and therefore appear more youthful, so that Holocene eruptions are uncertain for many of these Sredinny Range eruptive vents.