STEPHENSON: TONGUE, A NEW TERM 249 



Lee County. These relations are graphically shown in figure 2. 

 An exposure in an abandoned portion of the Fulton road, 1| 

 miles east of Tupelo, is considered the type section (Table 1), 

 though the town of Tupelo is itself underlain by the sand be- 

 neath a relatively thin covering of Pleistocene terrace deposits. 



TABLE 1 



Section in an Abandoned Portion of the Fulton Road, l£ Miles East op 



Tupelo 



Eutaw formation (Tupelo tongue of Coffee sand member) 

 Weathered massive reddish ferruginous marine sand, grading 

 downward into yellowish-green massive slightly glauconitic 

 sand 



Massive gray, more or less calcerous, glauconitic sand, with sev- 

 eral widely separated ledges of calcerous sandstone. Gry- 

 phaea vesicularis (Lamarck) var., abundant in a layer 15 to 

 25 feet below the top, and Exogyra ponderosa Roemer and 

 Gryphaea vesicularis (Lamarck) var., fairly abundant in a 

 layer 10 feet below the top 



Feet 



30 



50 



The thickness of the Tupelo tongue as shown by the logs of 

 wells at and near Tupelo is 100 feet. . 



The Tupelo tongue is physiographically expressed by the hills 

 in its area of outcrop, which contrast with the subdued topog- 

 raphy of both the area to the west underlain by the Selma 

 chalk, and the area to the east underlain by the Mooreville 

 tongue of the Selma. 



Oktibbeha tongue of Selma chalk. A long thin tongue of chalk 

 projects from the extreme top of the Selma chalk in northwes- 

 tern Noxubee County, northward through the counties of Ok- 

 tibbeha, Clay, and Chickasaw, conformably above the south- 

 ward extending nonchalky sands and clays of the Ripley forma- 

 tion (see fig. 2). This chalk forms the uppermost part of the 

 Upper Cretaceous and is unconformably overlain by strata of 

 Midway age (Eocene). The chalk is typically exposed in gul- 



