Cobre Ridge caldera explained

The Cobre Ridge caldera is a large Jurassic volcano in the U.S. state of Arizona. It formed about 170 million years ago when a VEI-8 eruption ejected more than 1000km3 of crystal-rich rhyodacite ignimbrite.^[1]

External links

• Web site: Cobre Ridge. The Collapse Caldera Database.

Notes and References

1. Riggs . Nancy R. . Busby-Spera . Cathy J. . 1991 . Facies analysis of an ancient, dismembered, large caldera complex and implications for intra-arc subsidence: Middle Jurassic strata of Cobre Ridge, southern Arizona, USA . Sedimentary Geology . en . 74 . 1-4 . 39–68 . 10.1016/0037-0738(91)90034-B.