Mapping Units

Qd – Dune sands, primarily Lone Sand Hill and satellite dunes to the southeast.
Qe Eolian sand (Holocene)- Very fine to medium sand; pale-brown and pale yellowish-brown;
laminated cross-stratification and horizontal bedding. Occurs as a stabilized parabolic dune up to
10 m thick along the southwest edge of the quadrangle.
Consists of 0-15 m of brown, pale brown, grey or reddish brown intermixed sand, silt,
clay and gravel reworked from local terrestrial deposits of early Miocene through
Pleistocene or Holocene age, and volcaniclastic sediments of Eocene through early
Miocene age. Occurs as sheets or ribbons of sediment along extant or older drainages.
May contain one or more buried soils. May contain fossil or subfossil vertebrates.
Ta – Arikaree Group (undifferentiated)
Tuh – Anderson Ranch Formation of early Miocene age, comprising fine-grained pale gray to
gray-white sandstones with extensive calcareous cementation, particularly developed within a
terminal paleosol horizon (unit occurs only in secs. 14, 15, 21, 22 and 28, T27N, R55W).