Pu`u Kali`u (Well Salted Hill)

Pu'u Kali'u is a cinder and spatter cone that erupted between about 400 and 750 years ago. Part of the cone is gone due to mining, and is visible as the dark area of the cone.

Photo: hvo.wr.usgs.gov/gallery/kilauea/erz/lower/20010918-NN-1...
Reference: hvo.wr.usgs.gov/gallery/kilauea/erz/lowererz.html