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 1,000 km3 (240 cu mi) of crystal-rich rhyodacite ignimbrite.[1]

References

  • "Cobre Ridge". The Collapse Caldera Database.

31°21′47″N 111°07′37″W / 31.363°N 111.127°W / 31.363; -111.127

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