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Ora Caldera
Extinct Permian-aged supervolcano in southern Italian Alps From Wikipedia, the free encyclopedia
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The Ora Caldera is a Permian supervolcano in the Southern Alps of northern Italy.[1] This 42-kilometre-wide (26 mi) and 40-kilometre-long (25 mi) caldera was formed by a supereruption 277–274 million years ago that produced more than 1,000 km3 (240 cu mi) of rhyodacitic-rhyolitic ignimbrite.[1][2][3] The ignimbrite from this eruption forms the 10-to-1,350-metre-thick (33 to 4,429 ft) Ora Formation, which represents the youngest eruptive unit of the Athesian Volcanic Group.[1][3]
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