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Shaded relief map of the Llano Estacado. Texas contains a wide variety of geologic settings. The state's stratigraphy has been largely influenced by marine transgressive-regressive cycles during the Phanerozoic, with a lesser but still significant contribution from late Cenozoic tectonic activity, as well as the remnants of a Paleozoic mountain range.
Basins of the Rio Grande Rift Map of physiographic provinces of New Mexico. New Mexico is entirely landbound, with just 0.2% of the state covered with water, [1] and most of the state has an arid to semiarid climate. [2] Much of the state is mountainous, except for the easternmost Great Plains region. [3]
Locality map showing the Rio Grande rift extending from southern Colorado to Chihuahua, Mexico. The Rio Grande follows this rift for much of its course. The Rio Grande rift is a north-trending continental rift zone. It separates the Colorado Plateau in the west from the interior of the North American craton on the east. [1]
The Texas State Historical Society states it covers all or part of 33 Texas counties, six fewer than as depicted by a US Geological Survey map, and four New Mexico counties. [2] As depicted by a US Geological Survey map, the Llano Estacado includes all or part of these Texas counties: [12] [13]
The Raton Basin is a geologic structural basin in southern Colorado and northern New Mexico. It takes its name from Raton Pass and the town of Raton, New Mexico. In extent, the basin is approximately 50 miles (80 km) east-west, and 90 miles (140 km) north-south, in Huerfano and Las Animas Counties, Colorado, and Colfax County, New Mexico.
Shaded relief map of the United States, showing 10 geological provinces. The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great mountain ranges while the forces of ...
The Natural History of New Mexico Mammals. Albuquerque: University of New Mexico Press. Hawley, JW (1978). Guidebook to Rio Grande rift in New Mexico and Colorado. New Mexico Bureau of Mines and Mineral Resources. p. 55. Kempter, Kirt (2007). "Valles Caldera:Map and Geologic History of the Southwest's Youngest Caldera".
Sangre de Cristo Formation in road cut in Glorieta Pass, New Mexico The formation is divided into an informal lower member and an upper Crestone Conglomerate Member. The lower informal member consists of about 600–900 meters (2,000–3,000 ft) of red arkosic sandstone , conglomeratic sandstone, siltstone , and shale .