Pg. 11 (fig. 4), 55-58, pls. Detonti sand of Wilcox group. Homogeneous sand unit containing some interbedded gray clay lenses and a prominent lignite bed at base. Best known from drillholes; as interpreted from logs thickness ranges from 207 to 412 feet. Unconformably overlies Saline formation (new); covered at many localities by deposits of gravel of late Tertiary age. Age is Eocene.
Type section: on east bank of first prominent gully west of Detonti on Detonti-Tull Road near center of NW/4 NW/4 NW/4 sec. 4, T. 3 S., R. 14 W., Saline Co., [Tull 7.5-min quadrangle], central AR. Named from settlement of Detonti on Missouri Pacific RR. Crops out in irregular northwestward-trending belt up to 3 mi wide and is probably continuous across bauxite region. Cut off at northeast by overlap of sediments higher in section and by Quaternary alluvial sediments of Arkansas River flood plain.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1100).
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