74 Upper Cretaceous Fauna from Tennessee [272 



a large number of new species but several forms which are 

 regarded as new genera. 2 Further collections were made at 

 this place and in the adjoining regions during the field- 

 season of 1916. The writer has begun, for the Tennessee 

 Geological Survey, an investigation of all the Upper Cre- 

 taceous deposits of the state and hopes to submit in the near 

 future a detailed report on the Stratigraphy and Systematic 

 Paleontology of these rocks. 



GENERAL GEOLOGICAL EELATIONS. 



The Upper Cretaceous deposits of Tennessee outcrop in a 

 wedge-shaped area which crosses the State in a nearly 

 north and south direction, and lies largely west of the Ten- 

 nessee Eiver in the west-central part of the State. This area 

 is about 67 miles wide along the southern boundary of the 

 State, narrowing to the northward until at the Kentucky 

 line it is only about 15 miles in width. 3 Along the southern 

 border of the State in Wayne, Hardin, McNairy and Harde- 

 man counties these deposits may be segregated into the fol- 

 lowing lithologic units. 



f Owl Creek horizon 



-r>. , ! McNairy sand member 



Eipley formation J _ . . 



] Ferruginous clay horizon 



[Coon Creek horizon 

 Selma chalk 

 Eutaw formation 

 Tuscaloosa formation 



The present discussion is limited to the lower part of the 

 Eipley. This formation covers the western two-thirds of 

 McNairy County, and in general is well exposed over that 

 entire region. The four horizons or members of the Eipley 



2 Some of these have been described in the Proc. Phila. Acad. Nat. 

 8ci., 1916, pp. 455-471, pi. 23, 24. 



3 Jenkins, 0. P., Geological Map of Tennessee, State Geol. Survey, 

 1915. 



