English: Katmai National Park Geologic Map, where nig is the Episode I valley-filling ignimbrite of 6-7 June 1912, bu is Late Jurassic Naknek Formation basement rock, nrd is the Novarupta rhyolite dome and ap its pumiceous alluvium, while ks, kbn and kn are Mount Katmai Late Pleistocene andesites and khi is the Horseshoe Island dacite. Mount Griggs' andesites are represented by gma, gyl and gyo, while gdo is the Knife Peak debris avalanche, and npe are phreatic explosion deposits. The Falling Mountain dacite dome is represented by tfc and glacial till deposits are represented by gh for Holocene and gp for Late Pleistocene.