SECTIO-VS IX THE NOTTOWAY RIVER VALLEY. 153 



XIV. Section left bank of Blackwater River just below Cobbs Wharf, about 

 seven miles below South Quay. 



Feet 



Miocene. St. Mary's Yellowish sand 6 



Bluish-green sandy clay, slightly fossiliferoiis G 



Total 12 



SECTION'S IN THE NOTTOWAY RIVER VALLEY. 



Although high bluffs are not common along the Nottoway River yet nev- 

 ertheless there are numerous exposures of Miocene strata in the compar- 

 atively low river banks where the stream has cut through the thin covering of 

 Pleistocene gravels, sands and clays. The St. Mary's is the only Tertiary 

 formation exposed along the Nottoway River. It consists mainly of blue 

 sand or sandy clay in which are occasional lenses of shell marl. 



I. Section in well at lumber mill tivo miles southeast of Sussex CourtJionse. 



Feet 



Miocene. St. Mary's Yellowish sand and sandy clay 8-10 



IMiiish-green sandy marl 2-4 



Total 14 



At the base of Marl Hill, a bluff about 70 feet high on the right bank of 

 the Nottoway River 21/0 miles south of Lumberton, tliere is a good marl bed 

 exposed 15 to 30 feet above the water. The lower portion of this bed is blue 

 in color while the upper weathered part is light yellow. 



Yellowish partially indurated sandy marl belonging to the St. Mary's 

 formation outcrops in the right bank of the Nottoway River at Carey's 

 Bridge, about IV2 miles west of Sebrell. 



On the right bank of the Nottoway River about 4 miles (air line) above 

 Courtland Bridge, there is a bank 60 feet or more in height, in which the 

 St. Mary's formation is exposed. Marl was dug from the lower part of this 

 bank some years ago but it is now concealed by cliff debris. 



On the left bank of the Nottoway River about one-half to three-quarters 

 of a mile above Cypress Bridge, bluish-green sandy marl outcrops about 5 

 feet above the water. The upper and loAver portions of the bluff are con- 

 cealed by vegetation and talus. 



