Two well-preserved reddish-brown basaltic cinder cones cap a small shield volcano of the Alligator Lake volcanic complex in southcentral Yukon. These cinder cones are likely younger than the adjacent Holocene glaciation and both cones were erupting at the same time. These cinder cones produced alkaline olivine basalt to basanitic lava flows that extend to the north. Lava flows from the northeast cone are the largest, extending from the cone and expanding to a width of at the end. Sections of the lava flows comprise spinel lherzolite, xenoliths composed of granite and megacrysts of olivine, pyroxene and spinel.