(Selma group), Light-gray cross-bedded to massive glauconitic sand and sandy clay and calcareous sandstone.
(Selma group), Chalk and marly chalk containing fewer impurities than underlying and overlying formations.
More or less cross-bedded and thinly laminated glauconitic sand and clay; basal part includes the McShan formation, greenish-gray, micaceous, locally very glauconitic, very fine-grained sand and thin-bedded light-gray clay, small chert gravels may be present in basal beds, not recognized in northern Tishomingo County.
Massive fine glauconitic sand.
(Selma group), Gray to greenish-gray fine glauconitic sand, clay, and sandy limestone; south of Oktibbeha County is very sandy micaceous chalk.
(Selma group), Red and white cross-bedded micaceous sand and white sandy clay.