Pg. 74-75. Basic claystone. Marine beds, consisting of (descending): (1) white quartzite, 20 feet (to west these beds characterize the claystone and pass into soft sandstone); (2) yellowish-white claystone, 100 feet; (3) semi-indurated grayish glauconitic sand, 10 feet. A phase of Tallahatta formation. Rests conformably on Winona sand phase of Tallahatta formation. [Age is middle Eocene.]
[Named from exposures at Basic City, Clarke Co., southeastern MS.]

Source: US geologic names lexicon (USGS Bull. 896, p. 123).

†Basic City claystone of Claiborne group. Is a facies of Tallahatta formation for which a geographic name is considered unnecessary. The true Winona sand has been proved, by later work of C.W. Cooke, to be a member of Lisbon formation.

Source: US geologic names lexicon (USGS Bull. 896, p. 123).

Pg. 15-24, fig. 1, pl. 2, profile C. Basic claystone member of Tallahatta formation. Is stratigraphic and lithologic equivalent of type section of Tallahatta formation in Alabama. Term Basic is used here because it was found necessary to set up another member in Mississippi. Typical Tallahatta buhrstone section, herein called Basic claystone member, is well developed throughout eastern Mississippi, but in central and western parts of its outcrop, the typical facies is largely replaced by sand section herein named Neshoba member. Thickness in eastern Mississippi 50 to 115 feet; 10 to 90 feet in central part of outcrop; 5 to 30 feet through southern and central Montgomery County. Overlies Meridian sand. At type locality, overlain by Winona greensand. In this report, base of Claiborne is placed at base of Basic member. Age is middle Eocene.
Type locality: deep cut on railroad just north of Basic City, a railroad station in northwestern Clarke Co., southeastern MS.

Source: US geologic names lexicon (USGS Bull. 1200, p. 230).

Pg. 43-44, 55-56, pl. 1. Basic City shale member of Tallahatta formation. Term Basic [pronounced like classic] was used by Lowe (1919) as member of Tallahatta formation for lightweight material, typically exposed in cuts on Gulf, Mobile, and Ohio RR in vicinity of Basic Station, Clarke Co., southeastern Mississippi, which he described as claystone or diatomaceous earth. Other workers have indicated that indurated deposits at Basic are contemporary with Tallahatta shales and interfinger with them in northern Mississippi. As strike of member is followed northwest from Basic, beds become more fissile and laminated, although locally thin lenses retain structural characteristics of claystone or siltstone, by which terms they have long been designated. Although much of the member consists of sand in northern Mississippi, the identifying characteristic over larger areas is lightweight shale. It seems advisable to retain term "Basic" for this member and, to prevent confusion from mispronunciation, to designate it Basic City shale member. In area of this report [Grenada, Montgomery, and Yalobusha Cos.], Basic City conformably overlies Meridian sand member of Tallahatta and underlies Winona sand member of Lisbon formation. Thickness irregular due to nature of lower contact; 79 feet on Gunby Hill, Montgomery County. [Age is middle Eocene.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 230).

Basic City shale member of Tallahatta formation. Correlation chart shows Basic City shale member underlies Neshoba sand member and overlies Meridian sand member. Interfingers with Holly Springs sand member. In some areas underlies Winona formation. [Age is middle Eocene.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 230).

Tallahatta Formation of Claiborne Group in Newton Co., MS, is divided into the lower Basic City Shale Member and the upper Neshoba Sand Member. In the study area, the Basic City is a thick sequence of shale interbedded and interlaminated with sand and silt. Burrowing is common, but unit is sparingly fossiliferous. Guide fossil ANODONTIA AUGUSTANA, common in AL, is rare in MS. Surface exposures reveal light- to very light-gray, well lithified sandstone, interbedded with lithified siltstone and claystone. Nonlithified sediments are dark-gray to dark greenish-gray. Exposures occur mainly in the eastern portion of the county, in T7&8N, R13E. Thickness ranges from a minimum of 83 ft in Test Hole A0-5 to a maximum thickness of 130 ft in water well L1. Disconformably overlies the Meridian Sand of Claiborne Group. Contact with the overlying Neshoba Sand Member is conformable. Age is Eocene. Measured section. Geologic map. Stratigraphic column.

Source: GNU records (USGS DDS-6; Reston GNULEX).