| Sierra El Aliso | |
|---|---|
  Sierra El Aliso  Sierra El Aliso | |
| Highest point | |
| Coordinates | 28°38′46″N109°42′19″W / 28.64611°N 109.70528°W Coordinates: 28°38′46″N109°42′19″W / 28.64611°N 109.70528°W |
| Geography | |
| Country | Mexico |
| State | Sonora |
Sierra El Aliso is a mountain range in the state of Sonora, Mexico.
Sierra El Aliso is 186 kilometres (116 mi) east-southeast of Hermosillo. [1] The municipality of San Javier is located in the extreme southwest of the Sierra El Aliso, 25 kilometres (16 mi) west of the Yaqui River. [2] The Sierra El Aliso is adjacent to the Sierra de San Javier. [3] Both lie in the Barranca Basin. [4] An unnamed high point in the Sierra el Aliso has a prominence of 760 metres (2,490 ft) and elevation of 1,380 metres (4,530 ft), and is isolated by 24.72 kilometres (15.36 mi) from Las Tierras South, to the northeast. [5]
The climate is hot and very humid, with summer temperatures often higher than 40 °C (104 °F). Most of the rainfall occurs in July, August and September. [6] At higher elevations the range holds oak and pine trees, while lower down there is underbrush, some cacti, grass and small shrubs. [7] The sierra contains the village of San Antonio de la Huerta, with about 500 people in 1990, mostly engaged in mining, cattle ranching and agriculture. Of these, mining is the main occupation. [6]
The Sierra El Aliso is near the center of the Mojave-Sonora Megashear, where both deep water Paleozoic deposits and miogeoclinal shelf facies are found. [8] During the Paleozoic huge volumes of sediments accumulated in deep basins beside the western margin of the North American continent, and were then deformed and thrust faulted against miogeoclinal shelf rocks of the continent during the Antler and Sonoma orogenies. [8] The Sierra El Aliso is composed of assemblages of Paleozoic origin, with less significant volcanic rocks of Triassic and perhaps Cretaceous-Tertiary origin. [1] Middle Mississippian fossils in the Sonora allochthon have been found in the Sierra El Aliso. [9] Possible Early Pennsylvanian foraminifera were also found. [10] An assemblage of conodonts from late Meramecian to early Chesterian would have formed in deep water. [11]
The Sierra Madre Occidental is a major mountain range system of the North American Cordillera, that runs northwest–southeast through northwestern and western Mexico, and along the Gulf of California. The Sierra Madre is part of the American Cordillera, a chain of mountain ranges (cordillera) that consists of an almost continuous sequence of mountain ranges that form the western 'sounds' of North America, Central America, South America and West Antarctica.
The Antler orogeny was a tectonic event that began in the early Late Devonian with widespread effects continuing into the Mississippian and early Pennsylvanian. Most of the evidence for this event is in Nevada but the limits of its reach are unknown. A great volume of conglomeratic deposits of mainly Mississippian age in Nevada and adjacent areas testifies to the existence of an important tectonic event, and implies nearby areas of uplift and erosion, but the nature and cause of that event are uncertain and in dispute. Although it is known as an orogeny, some of the classic features of orogeny as commonly defined such as metamorphism, and granitic intrusives have not been linked to it. In spite of this, the event is universally designated as an orogeny and that practice is continued here. This article outlines what is known and unknown about the Antler orogeny and describes three current theories regarding its nature and origin.
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