Mammoth Mountain rises to the SE of Minaret Summit. The 3369-m-high volcano formed between about 111,000 and 57,000 years ago and consists of a series of trachydacitic and rhyodacitic lava flows and lava domes. Magmatic activity at Mammoth Mountain overlapped the latest eruptions of the Long Valley caldera and ended prior to the onset of eruptions at the Mono-Inyo chain, although phreatic eruptions on the northern flank of Mammoth Mountain took place during the Holocene.

Photo by Lee Siebert, 1998 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Mammoth Mountain