200 physiography and geology of the coastal plain province. 



Eocene. 



The Virginia Eocene formations already described under the name of 

 Paimmkey group are limited to the province comprising Virginia, ^lary- 

 land, and Delaware and already described by the senior author of this 

 report." 



The same author in discussing the district from New Jersey to North 

 Carolina in a recent paper says:^ 



"The Eocene deposits of New Jersey, known as the Shark liiver forma- 

 tion (glauconitic beds), apparently overlie the Manasquan formation con- 

 formably. The contained fossils show the beds to be of early Eocene age. 

 Farther south in Maryland and Virginia, but nowhere in contact with the 

 Shark River beds, is a series of younger and conformable Eocene deposits 

 -known as the Aquia and Nanjemoy formations (glauconitic beds, clays, 

 sands), which overlie the Cretaceous unconformably. Entirely discontin- 

 uous are the North Carolina Eocene strata, which Miller has named the 

 Trent and Castle Hayne formations (calcareous marls, clays), and which 

 are of still later Eocene age. The latter are apparently unconformable to 

 each other, and likewise rest unconformably on Cretaceous deposits.' 



The Aquia Formation. 



The Aquia formation can be traced from southern Virginia across 

 Maryland to the Delaware border. The materials throughout this area are 

 similar and the fossils identical. Both to the north and to the south of this 

 region the Aquia formation is transgressed by later deposits and does not 

 again appear at the surface. Among the characteristic fossils are : 



Plenrotonia polomacensis Clark and Venericardia planicosta var. regia Conrad 



Martin Crassatellites alaeformis (Conrad) 



Turritella mortoni Conrad Pliolodomya marylandica Conrad 



Panopea elongata Conrad Modiolus alahamensis Aldrich 



Meretrix ovata var. pyga Conrad Ostrea compressirostra Say 



Dosiniopsis lenticularis (Rogers) Cucullaea gigantea Conrad 



The Aquia formation affords many species identical with those of the 

 Wilcox of the Gulf, the fossils on the whole being more characteristic of the 

 lower division although a number of forms are found only in the upper Wil- 

 cox and Claiborne horizons in Alabama. It is evident that manv of the 



o Clark, W. B. Bull. U. S. Geol. Survey, No. 141. 1896; Clark and Martin, Md. 

 Geol. Survey, Eocene, 1901. 



bClark, W. B. Bull. Geol. Soc. Amer.. Vol. xx, p. 649 (190S). 1910. 



