68 



GEOLOGICAL RErORT. 



[T108 



(Sec. 5.) 

 SECTION OF CRETACEOUS STRATA AT BARTON, LOWNDES CO. 



The prodigious number of shark's teeth and fragments of shark's jaws found 

 in the lower indurate ledge (belonging to the Tombigbee Sand Group) is a 

 remarkable feature of this outcrop. The lowest stratum is lithologically undis- 

 Unguishable *">"* the same at Warren's mill (11104, Sec. 3), but contains only 

 . obscure traces of lignitic matter. 



I am not aware that the Eutaw Group is exhibited in any outcrop S. of this, 

 in Mississippi. At Columbus, it is struck after passing through about 100 feet 

 of sands more or less micaceous and calcareous ; the borings show the material 

 to consist of layers of bluish or gray, and reddish clay, interstratified with sand. 



II. THE TOMBIGBEE SAND GROUP. 

 108. The surface of the territory occupied l>y this group (indi- 

 cated on the map by the dark green tint) is generally characterized 

 by sandy hills, capped with the Change Sand strata. We there- 

 Ion: perceive quite a sudden change in passing we^ward from it to 

 the territory if the Roittn Limestone, \iith gently undulating 



