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Origin of the Yellowstone Caldera. Caldera, which lies at the heart of Yellowstone National Park, is the tip of a huge volcano, which is in turn, bound to a hot spot.This is a fixed point within the earth's crust, where hot magma rises to the top. This accumulates below the earth's surface, thereby forming an underground magma chamber.aldera, which lies at the heart of Yellowstone National Park, is the tip of a huge volcano, which is in turn, bound to a hot spot. This is a fixed point within the earth's crust, where hot magma rises to the top.
Geologic History. Crater Lake partially fills a type of volcanic depression called a caldera that formed by the collapse of a 3,700 m (12,000 ft) volcano known as Mount Mazama during an enormous eruption approximately 7,700 years ago.The climactic (caldera-forming) eruption of Mount Mazama changed the landscape all around the volcano.ount Mazama rose to an approximate height of 3,700 m (12,000 ft) above sea level. The erupted magma was mainly andesite. The caldera wall displays the geologic layering of lava flows through time. As the volcanic complex evolved, so did its eruptive style.