Franklin Mountains (Texas)

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Franklin Mountains
El Paso Franklin Mountains and Scenic Drive aerial.jpg
Aerial view of the Franklin Mountains from the south, with El Paso's Scenic Drive at the bottom, and New Mexico's Organ Mountains on the horizon in the distance
Highest point
PeakNorth Franklin Peak
Elevation7,192 ft (2,192 m)
Coordinates31°54′10″N 106°29′36″W / 31.90278°N 106.49333°W / 31.90278; -106.49333Coordinates: 31°54′10″N 106°29′36″W / 31.90278°N 106.49333°W / 31.90278; -106.49333
Geography
CountryUnited States
StatesTexas and New Mexico
Geology
OrogenyLaramide orogeny
Age of rockCretaceous
Type of rockSedimentary, Igneous

The Franklin Mountains of Texas (previously known as Las Sierras de los Mansos[1]) are a small range (23 miles long, 3 miles (4.8 km) wide) that extend from El Paso, Texas north into New Mexico.[2] The Franklins were formed due to crustal extension related to the Cenozoic Rio Grande rift. Although the present topography of the range and adjoining basins is controlled by extension during rifting in the last 10 million years, faults within the range also record deformation during the Laramide orogeny, between 85 and 45 million years ago.

The highest peak is North Franklin Peak at 7,192 feet (2,192 m). Much of the range is part of the Franklin Mountains State Park. The mountains are composed primarily of sedimentary rock with some igneous intrusions. Geologists refer to them as tilted-block fault mountains and in them can be found 1.25 billion-year-old Precambrian rocks,[3] the oldest in Texas.[2][4]

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References[edit]

  1. ^ Miles, Robert W. (2010-06-12). "Franklin Mountains". tshaonline.org. Retrieved 2020-03-29.
  2. ^ a b Van Hise, C. R.; Leith, C. K. (1909). Pre-Cambrian Geology of North America. United States Geological Survey, Bulletin. 360. pp. 746–748. doi:10.3133/b360. OCLC 271845.
  3. ^ "Franklin Mountains State Park : Interpretive Guide" (PDF). Texas State Parks. 2019. Precambrian rocks can be seen in the Tom Mays unit of the Franklin Mountains park.
  4. ^ Brooks, A. H. (1904). "The Geological Society of Washington". Science. NS. 19 (490): 794–796. doi:10.1126/science.19.490.794.
  5. ^ Richardson, G. B. (1909). El Paso folio, Texas. United States Geological Survey, Folios of the Geologic Atlas. No. 166. Figure 10. doi:10.3133/gf166. OCLC 2514134.

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