The Fish Canyon Tuff, erupted from the La Garita caldera, is the second and largest of eight major ash-flow sheets erupted from the productive central San Juan caldera cluster, which generated approximately 8000 km 3 of silicic deposits through eight caldera-related eruptions during <2.5 million years (Lipman, 2000). The La Garita Caldera produced one of the largest known eruptions on earth. The La Garita caldera-forming eruption is estimated as one of the largest eruptions on Earth. The mother of all volcanoes erupted 27.8 million years ago, creating what is believed to be Earth’s largest caldera. We have written many articles about volcanoes for Universe Today. A caldera is formed when the contents of a volcano have been ejected and the earth collapses into the empty magma chamber. The La Garita volcano seems to have erupted over the course of less than a week as much as 3,000 cubic miles of magma. Located in Colorado, the volcano deposited 1,200 cubic miles of magma approximately 27 million years ago. Where are active volcanoes located? Two continental plates once collided here and caused the ground to fracture and faults to form. About half a million people live in Campi Flegrei's seven-mile-long caldera, which was formed by vast eruptions 200,000, 39,000, 35,000 and 12,000 years ago. After collapse of La Garita caldera, seven additional explosive eruptions and calderas of variably smaller size formed inside La Garita depression during about one million The La Garita Caldera eruption in Colorado erupted about 28 million years ago, blasting out 5,000 cubic kilometers of ash. Located in the southwestern part of the state, the volcanic field was once extremely active. It lies in the midst of a huge region in the Rocky Mountains called the San Juan Volcanic Fields. 2). One of them, the Creede, is sliced through now by the Rio Grande. La Garita Caldera is a large volcanic caldera located in the San Juan Volcanic Field in the San Juan Mountains near the town of Creede in southwestern Colorado, United States.It lies to the west of the town of La Garita, Colorado. The La Garita caldera in Colorado’s San Juan Mountains is an astonishing 22 miles wide and 62 miles long. The giant scar was formed by the most explosive volcanic eruption on the planet to date. == == The Caldera itself was formed about 28Ma years ago, however the Dotsero Volcano last erupted about 4100 years ago which is not that long in the geographical scheme of things. The caldera is 22 miles wide by 47 miles long. La Garita was among 18 volcanoes that went off between 20 and 30 million years ago leaving behind a string of calderas. 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