Pg. 56-58. Bingen sands. Extensive arenaceous formation, consisting of fine white quartz sand with occasional thin beds of lignite. Can only be classified as isolated outcrops of concealed westward continuation of upper and lower beds of typical Camden series. Includes many nodular concretions of iron ore and often extensive layers of ferruginous sandstone. Constitutes most of sandy uplands of eastern Howard, western Hempstead, southern Sevier, Little River, Nevada, and Clark Counties, Arkansas. Occupies same relative position above Arkadelphia shales as does Camden series. Included in Eocene.
Named from exposures near Bingen, Hemstead Co., southwestern AR.

Source: US geologic names lexicon (USGS Bull. 896, p. 189).

Table opp. p. 16, p. 23-25. Bingen sand. Near-shore deposits, of white or brown sands and clays containing some greensand and considerable lignite or lignitiferous matter. Maximum thickness over 500 feet. Basal formation of Upper Cretaceous. Time equivalent of Woodbine sand, Eagle Ford clay, and Sub-Clarksville sand [Blossom sand]. Underlies Brownstown formation and overlies Washita group.

Source: US geologic names lexicon (USGS Bull. 896, p. 189).

Upper Cretaceous (Gulfian series) †Bingen formation (also †Bingen sand) now [ca. 1938] divided into Tokio formation above and Woodbine sand below. See under Tokio formation.
[Previously recognized in southwestern Arkansas, southeastern Oklahoma, and northwestern Louisiana.]

Source: US geologic names lexicon (USGS Bull. 896, p. 189).