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Town of La Madera, New Mexico. Named by. Charles Rollin Keyes. Year defined. 1903. Madera Group (New Mexico) Outcrops of Madera Group in New Mexico. The Madera Group is a group of geologic formations in northern New Mexico. Its fossil assemblage dates the formation to the middle to late Pennsylvanian period .
The geology of New Mexico includes bedrock exposures of four physiographic provinces, with ages ranging from almost 1800 million years (Ma) to nearly the present day. Here the Great Plains, southern Rocky Mountains, Colorado Plateau, and Basin and Range Provinces meet, giving the state great geologic diversity.
The Picacho Limestone of the Pecos River valley was correlated with the San Andres Formation by Lang in 1937, who abandoned the Picacho Limestone as a formation name. [9] By 1937 the San Andres was being recognized as an important unit in the subsurface in eastern New Mexico and west Texas.
The Kelly Limestone consists of approximately 30 meters (98 ft) of marine limestone. [1] It is found in the Lemitar, Ladron, and Magdalena Mountains of west-central New Mexico, US. [2] The formation rests on Precambrian basement rock and is overlain by the Sandia Formation. The Kelly Limestone is divided into a lower Calosa Member and an upper ...
The San Juan Basin is an asymmetric structural depression in the Colorado Plateau province, with varying elevation and nearly 3,000 feet (910 m) in topographic relief. Its most striking features include Chaco Canyon (northwestern New Mexico, between Farmington and Santa Fe) and Chacra Mesa. The basin lies west of the Continental Divide, and its ...
El Paso Formation forms the lowest part of the massive limestone beds atop Timber Mountain, New Mexico, USA. The formation is composed of gray cherty dolomite, limestone, and smaller amounts of siltstone. [4] The formation often has a mottled appearance. [5]
Atrasado Formation. / 34.699; -107.120. The Atrasado Formation is a geologic formation in New Mexico. Its fossil assemblage dates the formation to the Kasimovian age of the Pennsylvanian. It was formerly known locally as the Wild Cow Formation or the Guadelupe Box Formation .
The formation was first named by E.D. Cope in 1882 for exposures at Lake Valley, Sierra County, New Mexico. [3] In 1941, Laudon and Bowsher removed the lowermost beds into the Caballero Formation and divided the Lake Valley Limestone into the Alamgordo, Arcente, and Dona Ana Members. [4] In 1949, they added the Andrecito, Nunn, and Tierra ...