Pg. 263. Fine sand, gravel, and silt 5 to 15 feet thick. Base 1 to 5 feet above base of arroyos. Age is late Pleistocene.

Source: US geologic names lexicon (USGS Bull. 1200, p. 4197-4198).

Pg. 22-23, 24 (fig. 9), 30 (table 2). Wheatland formation. Name proposed for terrace sediments at San Jon site. Each terrace remnant consists of fine basal gravel, mostly fragments of concretions from Ogallala sandstone, and of sand. Sand gravel layer is 1 to 3 feet thick and overlies irregular surface cut in older formations. Highest terrace has base 20 to 25 feet above grade of streams at point nearest head of canyon. Two lower terraces have bases at 8 to 10 feet and 1 to 5 feet above present grades. Each terrace records downcutting of streams through Sand Canyon and older formations with stabilization of grades and later slight alluviation. This episode was repeated three times before present stream grades were established. Highest terrace contain BISON BISON bones. Age is late Pleistocene.
Type locality: San Jon site, approximately 10 mi south of town of San Jon, Quay Co., eastern NM. Named from town of Wheatland, about 4.5 mi south of site.

Source: US geologic names lexicon (USGS Bull. 1200, p. 4197-4198).