Blanco Formation

Blanco Formation
Blanco Formation outcrops at Mount Blanco; note the minor resistant caliche bedding on the lower hill and the thicker caliche and limestone caprock on the higher bluff in the background.
TypeFormation
Sub-unitsKansas only:[1]
* Fullerton member
* Holdredge member
UnderliesPleistocene loess and soil
OverliesOgallala Formation
Lithology
Primarysand and gravel whitened by calcium carbonate
Location
RegionTexas, Kansas
CountryUnited States
Type section
Named forBlanco Canyon[1]
Named byWilliam F. Cummins[2]
Year defined1890

The Blanco Formation, originally named the Blanco Canyon Beds, is an early Pleistocene geologic formation of clay, sand, and gravel whitened by calcium carbonate cementation and is recognized in Texas and Kansas.[1]

After the Ogallala had lain exposed for some time since the Neogene, developing a thick caliche petrocalcic horizon under the surface, deposition of sand and gravel by wind and east-flowing streams resumed to lesser extent during the early Pre-Illinoian glaciation cycles of the Pleistocene. As the weathering and erosion of the exposed Ogallala, rich in calcium carbonate, contributed heavily to the formation, the resulting material is white (blanco). This gave the name to Blanco Canyon, which in turn is the type locality for the Blanco Formation. In Texas, the unit covers the extent of the Llano Estacado, attaining a thickness of 70 feet (21 m). Exceptionally flat, it is conjectured that the limestone beds in the Texas region formed within broad, shallow lakes.[1][3]

The Blanco Formation is recognized in Kansas where it attains a maximum thickness of over 250 feet (76 m). In much of its extent in Kansas, the Blanco is buried under deep Pleistocene loess and soil deposits and a certain amount of knowledge of the unit comes from well drilling. While the whole of the unit is clay, sand, and gravel, the lower part of the unit is coarser material and the upper part is finer and plastic, with enough distinction to identify two members. In Kansas, the upper member is named Fullerton and the lower is named Holdrege for their respective correspondence with the Fullerton Formation and Holdrege Formation that are identified in Nebraska. The Blanco is not recognized as a unit in Nebraska.[1][3]

See also

References

  1. ^ a b c d e "Geologic Unit: Blanco". National Geologic Database. Geolex — Unit Summary. United States Geological Survey. Retrieved 2020-06-15.
  2. ^ Cummins, W.F. 1890. The Permian of Texas and its overlying beds. In: Dumble, E.T. (ed), First annual report of the Geological Survey of Texas 1889, pp. 183-197.
  3. ^ a b John C. Frye; A. Byron Leonard (1952). Pleistocene Geology of Kansas, Bulletin 99. University of Kansas Publications, State Geological Survey of Kansas. p. Pleistocene Stratigraphy in Kansas. Pre-Illinoian = Nebrasan + Aftonian + Kansan +


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