Glass Creek Dome, California

Here is another rhyolitic dome in the Long Valley area, this time as part of the Inyo Chain. There are multiple domes that run roughly north-south along the Sierran front north of the Long Valley Caldera and this is my favorite, Glass Creek, that is draped over a pre-existing ridge. These were erupting almost simultaneous with Panum Crater and parts of the Mono chain - roughly 630 years ago. Ash from these eruptions can be found across Nevada as part of another VEI 4 event. Wes Hildreth in his seminal study of Long Valley thinks that the Mono-Inyo chain, although geographically close to the Long Valley caldera, is actually not magmatically-related to the giant caldera-forming systems that formed the caldera 740,000 years ago.

Image: Erik Klemetti