The Yeso Formation is a geologic formation in New Mexico. It is exposed in the mountains and other uplifts bordering the Rio Grande Rift and in the Pecos River valley. It preserves fossils dating back to the Leonardian (lower Permian period.)[1][2][3]

Yeso Formation
Stratigraphic range: Permian
TypeFormation
Unit ofManzano Group
UnderliesGlorieta Formation
OverliesAbo Formation
Thickness309 m (maximum)
Lithology
PrimarySandstone
OtherGypsum
Location
RegionNew Mexico
CountryUnited States
Type section
Named forMesa del Yeso 34°12′06″N 106°46′32″W / 34.2017512°N 106.7754422°W / 34.2017512; -106.7754422
Named byW.T. Lee (1909)

The formation is an orange eolian sandstone. In the Jemez Mountains, it consists of massive cross-bedded lower beds (Meseta Blanca Member) and thinner upper beds (San Ysidro Member) suggesting a more fluvial depositional environment.[4] The Meseta Blanca Member is likely correlated with the De Chelly Sandstone, and some geologists remove these beds from the Yeso and assign them to the de Chelly.[2][5] The Yeso Formation is exposed extensively in the Jemez Mountains, but pinches out in the northern Jemez, delineating the northern limit of the dune field from which it arose.[5]

Farther south, the formation is divided into the Torres Member and Joyita Member. An intermediate member, the Canas Member, is mapped at Mesa de Joya. It transitions from continental to shallow marine in character from north to south, with the lithology changing from eolian and sand sheet deposits in the north to sabkha deposits of gypsum and carbonate rock to the south. The formation is conformable with both the underlying Abo Formation and the overlying Glorieta Formation.[3]

See alsoEdit

FootnotesEdit

  1. ^ Needham and Bates (1943)
  2. ^ a b Baars (1962)
  3. ^ a b Stanesco (1991)
  4. ^ Wood and Northrop (1946)
  5. ^ a b Kelley 'et al.' (2006)

ReferencesEdit

  • Needham, C.E.; Bates, R.L. (1943). "Permian type sections in central New Mexico". Geological Society of America Bulletin. 54 (11): 1653–1667. doi:10.1130/gsab-54-1653.
  • Wood, G.H.; Northrop, S.A. (1946). "Geology of Nacimiento Mountains, San Pedro Mountain, and adjacent plateaus in parts of Sandoval and Rio Arriba Counties, New Mexico". U.S. Geological Survey Oil and Gas Investigations. Preliminary Map OM-57.
  • Baars, D.L. (1962). "Permian System of Colorado Plateau". American Association of Petroleum Geologists Bulletin. 46 (2): 149–218.
  • Stanesco, John D. (1991). "Sedimentology and Depositional Environments of the Lower Permian Yeso Formation, Northwestern New Mexico" (PDF). U.S. Geological Survey Bulletin (1808).
  • Kelley, S.A.; Lawrence, J.R.; Zeiger, K.E.; Osburn, G.R.; Lucas, S.G. (2006). "Geologic Map of the Arroyo del Agua Quadrangle, Rio Arriba County, New Mexico". New Mexico Bureau of Geology and Mineral Resources Open-File Geologic Map Series. 46 (124).