SECTIONS IN THE JAMES RIVER VALLEY. 



115 



On the right bank of the Pamunkey River at "Farmington," about one 

 mile from Apperson's store and about three-quarters of a mile east of New- 

 castle Bridge, 6 feet of gray calcareous sandy marl containing glauconite 

 similar to that at Newcastle is exposed at the base of a high bluff. 



TI. Section right hank of Pamunkey River at mouth of Matadequin Creek. 



At this point marl works were established some years ago and the green- 

 sand marl dug. sifted, and sold as a fertilizer. The section is as follows : 



Feet 



Pleistocene • Light colored yellow sand 4 



Miocene. Calvert Wlute friable sandy clay with fine gravel, fossil 



casts, and sharks teeth 6 



Olive green compact sandy clay stained brown 



in places 4-6 



Layer of small gravel containing bones and 



sharks teeth 2 in. 



Eocene. Nanjemoy Dark green, glauconitic, sandy marl (exposed) 2-3 



Total 19+ 



SECTIONS IN THE JAMES RIVER VALLEY. 



The Nanjemoy formation has a very limited distribution along the 

 James Eiver and there are few good exposures. The formation has not 

 been recognized south of the James and probably does not extend much 

 farther south. It is not exposed along the Nottoway or Meherrin rivers and 

 is positively known to be absent in the Eoanoke River valley. The forma- 

 tion in its most southerly exposures has not lost its typical characteristics 

 as the following sections will show, but instead resembles the Nanjemoy 

 strata of Maryland even more than those of the Pamunkey River valley. 



I. Section right hank of James River, two miles below City Point. 



Feet 



Pleistocene Loam with gravels at base 8 



Miocene. Calvert Shell marl, shells in buff to gray sand ; com- 



mon species are Chama, Ecphora, Venus, 

 Pecten, Perna, Crucihulum Crepidula, Oliva, 



Discinisca, Ostrea, etc 5 



Poor exposure, seems to be sand without 



fossils 7 



Shell bed, similar to above except without 



Ecphora, Discinisca, Oliva and Perna 4 



Eocene. Nanjemoy Marlboro pink to white to drab clay, very com- 

 pact 3-5 



Aquia ( ? ) Glauconitic sand containing much gypsum, 



in places exposed to water 15 



Total 44 



