| Mid-Tertiary ignimbrite flare-up | |
|---|---|
 Wheeler Geologic Area, rocks of the San Luis Caldera complex | |
| Volcano | Multiple cumulative events |
| Date | 25-40 million years ago |
| Location | Western United States |
| Impact | Deposited vast swatches of ignimbrite across the western United States |
The Mid-Tertiary ignimbrite flare-up,[a] was a dramatic period of volcanic eruptions in mid-Cenozoic time, approximately 25–40 million years ago, centered in the western United States.[2] These eruptions are seen today as deposits of ignimbrite, the pyroclastic material that was laid down from these eruptions.
- ^ Ogg, James G.; Gradstein, F. M; Gradstein, Felix M. (2004). A geologic time scale 2004. Cambridge, UK: Cambridge University Press. ISBN 0-521-78142-6.
- ^ Cannon, Eric. "The Mid-Tertiary ignimbrite flare-up". Archived from the original on 16 July 2012. Retrieved 14 August 2010.
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).