Upper south flank of Mauna Kea, Hawai‘i. Prominent cinder cone (low...

Pu‘u Keonehehe‘e and the two small cones immediately to the northwest (left) are among the youngest cones erupted on the volcano, as recent as about 4,000 years ago. The other cones in this view are part of the Laupahoehoe Volcanics, but much older, dating to 70,000 years ago. The light colored surface between the cones consists of glacial deposits with ages between 40,000 and 13,000 years or lava flows. A line of prominent scarps (arrows in center) is interpreted by geologists as a remnant fissure that erupted beneath a glacier during the Hamakua Volcanics more than about 70,000 years ago.