Name Memphis Sand given to "500-foot sand" at base of Claiborne Group. Unit is very light gray, fine- to coarse-grained lignitic sand, with minor silt and silty clay. Thickness 213 m. Major aquifer. Overlies Flour Island Formation of Wilcox Group; underlies Cook Mountain Formation of Claiborne Group. Age is middle Eocene.
Type section (subsurface): depth-interval 186 to 399 m, Fort Pillow test well, at the site of old Fort Pillow on the Mississippi River, Lat. 35 deg. 38 min. 39 sec. N., Long. 89 deg. 49 min. 35 sec. W., Lauderdale Co., west-central TN. Named from City of Memphis.
Source: GNU records (USGS DDS-6; Reston GNULEX); US geologic names lexicon (USGS Bull. 1520, p. 200).
Unit geographically extended from western TN to southeastern MO.
Source: GNU records (USGS DDS-6; Reston GNULEX).
Unit is geographically extended from western TN and southeastern MO into northeastern AR. Overlies Flour Island Formation of Wilcox Group; underlies Cook Mountain Formation of Claiborne Group. Age is Eocene.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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