A caldera is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the structural integrity of such a chamber, greatly diminishing its capacity to support its own roof, and any substrate or rock resting above. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface. Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur over the course of a century, the formation of a caldera is a rare event, occurring only a few times within a given window of 100 years. Only eight caldera-forming collapses are known to have occurred between 1911 and 2018, with a caldera collapse at Kīlauea, Hawaii in 2018. Volcanoes that have formed a caldera are sometimes described as "caldera volcanoes".
Mammoth Mountain is a lava dome complex partially located in the town of Mammoth Lakes, California, in the Inyo National Forest of Madera and Mono Counties. It is home to a large ski area primarily on the Mono County side.
The Valles Caldera is a 13.7-mile (22.0 km) wide volcanic caldera in the Jemez Mountains of northern New Mexico. Hot springs, streams, fumaroles, natural gas seeps, and volcanic domes dot the caldera landscape. The highest point in the caldera is Redondo Peak, an 11,254-foot (3,430 m) resurgent lava dome located entirely within the caldera and surrounded by moat-like flows of rhyolitic solidified lavas. Located within the caldera are several grass valleys, or valles, the largest of which is Valle Grande, the only one accessible by a paved road. In 1975, Valles Caldera was designated as a National Natural Landmark by the National Park Service with much of the caldera being within the Valles Caldera National Preserve, a unit of the National Park System. The area has a varied history involving cultural significance, economic resources, scientific studies, and complex geological setting.
Wheeler Peak is the highest natural point in the U.S. state of New Mexico. It is located northeast of Taos and south of Red River in the northern part of the state, and just 2 miles (3.2 km) southeast of the ski slopes of Taos Ski Valley. It lies in the Sangre de Cristo Mountains, the southernmost subrange of the Rocky Mountains. The peak's elevation is 13,167 feet (4,013 m).
Humphreys Peak is the highest mountain and the second most prominent peak after Mount Graham in the U.S. state of Arizona. With an elevation of 12,633 feet (3,851 m), it is located within the Kachina Peaks Wilderness in the Coconino National Forest, about 11 miles (17.7 km) north of Flagstaff, Arizona. Humphreys Peak is the highest of a group of dormant volcanic peaks known as the San Francisco Peaks.
The Jemez Mountains are a group of mountains in Rio Arriba, Sandoval, and Los Alamos counties, New Mexico, United States.
Chicoma Mountain is the highest point in the Jemez Mountains, a prominent mountain range in the U.S. State of New Mexico. The tree line in this area is exceptionally high, and the mountain is forested almost all the way to its summit which is conspicuous from the towns of Los Alamos, Santa Fe, and Española and other areas in the valley of the Rio Grande in northern New Mexico. Like the rest of the Jemez, it is of volcanic origin; it lies on the northeast rim of the Valles Caldera, one of the best examples of a caldera in the United States.
Santa Fe Baldy is a prominent summit in the Sangre de Cristo Mountains of New Mexico, United States, located 15 mi (24 km) northeast of Santa Fe. There are no higher mountains in New Mexico south of Santa Fe Baldy. It is prominent as seen from Los Alamos and communities along the Rio Grande in northern New Mexico, but is relatively inconspicuous from Santa Fe, as its north-south trending main ridge line is seen nearly end-on, disguising the size of the mountain. Tree line in the Sangre de Cristos is unusually high and only the top 600 to 800 feet of the mountain is perpetually free of trees, but several severe forest fires have created bare spots extending to lower elevations. An extensive region of aspen trees on its flanks produces spectacular orange-yellow coloration during the fall that is the subject of many photographic studies.
Mount Taylor is a dormant stratovolcano in northwest New Mexico, northeast of the town of Grants. It is the high point of the San Mateo Mountains and the highest point in the Cibola National Forest.
The Sierra Blanca is an ultra-prominent range of volcanic mountains in Lincoln and Otero counties in the south-central part of the U.S. state of New Mexico. The range is about 40 miles (64 km) from north to south and 20 miles (32 km) wide.
Venado Peak is one of the major peaks of the Taos Mountains group of the Sangre de Cristo Mountains, a subrange of the Rocky Mountains. It is located in Taos County, New Mexico, about 8 miles (13 km) northeast of the town of Questa. Its summit is the highest point in the Latir Peak Wilderness, part of Carson National Forest. The peak's name means "deer" in Spanish.
The Jemez Lineament is a chain of late Cenozoic volcanic fields, 800 kilometers (500 mi) long, reaching from the Springerville and White Mountains volcanic fields in East-Central Arizona to the Raton-Clayton volcanic field in Northeastern New Mexico.
Cerro Pedernal, locally known as just "Pedernal", is a narrow mesa in northern New Mexico. The name is Spanish for "flint hill". The mesa lies on the north flank of the Jemez Mountains, south of Abiquiu Lake, in the Coyote Ranger District of the Santa Fe National Forest. Its caprock was produced in the Jemez Volcanic Field. Its highest point is at 9,862 feet.
San Antonio Mountain is a free-standing volcanic peak in Rio Arriba County, New Mexico. With an elevation of 10,908 feet, San Antonio Mountain is the highest peak within the Taos Plateau volcanic field, the largest volcanic field within the Rio Grande Rift valley.
William Boone Douglass was a lawyer, engineer, surveyor, genealogist, and founding President of the Boone Family Association. Earlier in his engineering career, he was active in New Mexico both as an engineer and as an anthropologist.
The Bandelier Tuff is a geologic formation exposed in and around the Jemez Mountains of northern New Mexico. It has a radiometric age of 1.85 to 1.25 million years, corresponding to the Pleistocene epoch. The tuff was erupted in a series of at least three caldera eruptions in the central Jemez Mountains.
The Polvadera Group is a group of geologic formations exposed in and around the Jemez Mountains of northern New Mexico. Radiometric dating gives it an age of 13 to 2.2 million years, corresponding to the Miocene through early Quaternary.
The Keres Group is a group of geologic formations exposed in and around the Jemez Mountains of northern New Mexico. Radiometric dating gives it an age of 13 to 6 million years, corresponding to the Miocene epoch.
The Tewa Group is a group of geologic formations exposed in and around the Jemez Mountains of northern New Mexico. Radiometric dating gives it an age of 1.85 million to 72 thousand years, corresponding to the Pleistocene epoch.
