Bishop Tuff
| Bishop eruption | |
|---|---|
Two layers of the Bishop Tuff: lower layer was from ashfall, upper layer was from the main pyroclastic flow. | |
| Volcano | Long Valley Caldera |
| Date | 764,800 ± 600 years ago |
| Type | Ultra-Plinian |
| Location | California, United States 37°43′00″N 118°53′03″W / 37.71667°N 118.88417°W |
| Volume | Approx. 200 km3 (48 cu mi) |
| VEI | 7 |
Map of the Long Valley Caldera, with Bishop Tuff outlined. | |
The Bishop Tuff is a welded tuff which formed 764,800 ± 600 years ago as a rhyolitic pyroclastic flow during the approximately six-day eruption that formed the Long Valley Caldera. Large outcrops of the tuff are located in Inyo and Mono Counties, California, United States. Approximately 200 cubic kilometers of ash and tuff erupted outside the caldera.