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]
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]