The Halgaito Shale is the basal Permian geologic member of the Cutler Group in southern Utah.[3] The member consists of silty sandstone, siltstone and limestone.[1] The Elephant Canyon may grade into the Halgaito and the grades northward into the Cedar Mesa Formation.[4]

Halgaito Shale
Stratigraphic range: Permian
TypeFormation
Unit ofCutler Group[1]
UnderliesElephant Canyon Formation
OverliesHonaker Trail Formation of the Hermosa Formation[2]
Thickness350 to 800 feet (110 to 240 m)[1]
Lithology
PrimaryShale
Location
CountryUnited States
Type section
Named forNamed for Halgaito Spring, southwest of Medicine Hat, Navajo Co., AZ (Baker and Reeside, 1929).[3]
Named byBaker and Reeside, 1929[3]

ExtentEdit

There is no designated type locality for the Halgaito.[5] The shale can be seen at the confluence of the Green River and Colorado Rivers and in Cataract Canyon.[6]

ReferencesEdit

  1. ^ a b c Condon, Steven M. (1992). Zech, Robert S. (ed.). "Geologic framework of pre-Cretaceous rocks in the Southern Ute Indian Reservation and adjacent areas, southwestern Colorado and northwestern New Mexico" (PDF). U.S. Geological Survey Professional Paper (1505-A, Geology and mineral resources of the Southern Ute Indian Reservation): A1–A56. doi:10.3133/pp1505A. Retrieved 30 September 2018.
  2. ^ Scott, Kim M.; Sumida, Stuart S. (8 November 2004). "PERMO-CARBONIFEROUS VERTEBRATE FOSSILS FROM THE HALGAITO SHALE, CUTLER GROUP, SOUTHEASTERN UTAH". Denver Annual Meeting. Geological Society of America. Retrieved 30 September 2018.
  3. ^ a b c Baker, A.A.; Reeside, J.B., Jr. (1929). Correlation of the Permian of southern Utah, northern Arizona, northwestern New Mexico, and southwestern Colorado. American Association of Petroleum Geologists Bulletin. 13. pp. 1413–1448.
  4. ^ Condon, Steven M. (1997). "Geology of the Pennsylvanian and Permian Cutler Group and Permian Kaibab Limestone in the Paradox Basin, Southeastern Utah and Southwestern Colorado" (PDF). U.S. Geological Survey Professional Paper (2000–P, Evolution of sedimentary basins—Paradox Basin): A1–A56. doi:10.3133/b00P. Retrieved 30 September 2018.
  5. ^ "Halgaito Member of Cutler Formation". Geology of National Parks, 3D and Photographic Tours. United States Geological Survey. Retrieved 30 September 2018.
  6. ^ "Halgaito Shale/Lower Cutler Formation". Geology of Canyonlands. National Park Service. Retrieved 30 September 2018.