Canutillo Formation

Last updated
Canutillo Formation
Stratigraphic range: Middle Devonian
Type Formation
Underlies Percha Formation
Overlies Fusselman Formation
Thickness15 feet (4.6 m)
Lithology
Primary Siltstone
Other Shale
Location
Coordinates 31°55′N106°30′W / 31.92°N 106.50°W / 31.92; -106.50
Region Texas
CountryUnited States
Type section
Named for Canutillo, Texas
Named byL.A. Nelson
Year defined1940
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Canutillo Formation (the United States)
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Canutillo Formation (Texas)

The Canutillo Formation is a geologic formation that is exposed in the Franklin Mountains near El Paso, Texas. The formation is Middle Devonian in age. [1] [2]

Contents

Description

The Canutillo Formation consists of about 15 feet (4.6 m) of soft gray siltstone. It is unconformably overlain by the Percha Formation. The Canutillo Formation likely correlates with the Onate Formation. [1]

Fossils

The formation is fossiliferous, but few fossils are time diagnostic. Fossils include abundant Leiorhynchus and other brachiopods and a few pelecypods. [1]

History of investigation

The formation was first described in his dissertation by L.A. Nelson in 1937 for outcrops in the Franklin Mountains. Nelson assigned all beds between the Silurian Fusselman Formation and the Mississippian Helms Formation to the Canutillo. [3] Nelson formally published the definition in 1940 and extended the outcrop range to the Hueco Mountains. [4] In 1945, F.V. Stevenson restricted the formation to the Franklin Mountains. [5] In 1949, Lowell R. Laudon and Arthur L. Bowshwer restricted the formation to a sequence of just 15 feet (4.6 m) of soft gray siltstone. [1]

See also

Footnotes

  1. 1 2 3 4 Laudon, Lowell R.; Bowsher, Arthur L. (1949). "Mississippian formations of southwestern New Mexico". Geological Society of America Bulletin. 60 (1): 1. doi:10.1130/0016-7606(1949)60[1:MFOSNM]2.0.CO;2.
  2. ↑ Ludington, Steve; Hanna, W.F.; Turner, R.L.; Jeske, R.E. (1988). "Mineral resources of the Organ Mountains Wilderness Study Area, Dona Ana County, New Mexico". U.S. Geological Survey Bulletin. 1735-D. doi:10.3133/b1735D. hdl: 2027/osu.32435022084842 .
  3. ↑ Nelson, L.A. (1937). "Gastropoda from the Pennsylvanian (Magdalena) of the Franklin Mountains of west Texas [abstract of thesis]". Colorado University Studies. 25 (1): 89–91.
  4. ↑ Nelson, L.A. (1940). "Paleozoic Stratigraphy of Franklin Mountains, West Texas". AAPG Bulletin. 24 (1): 157–172. doi:10.1306/3D93319A-16B1-11D7-8645000102C1865D.
  5. ↑ Stevenson, Frank V. (July 1945). "Devonian of New Mexico". The Journal of Geology. 53 (4): 217–245. doi:10.1086/625283.

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