SECTIONS IN THE APPOMATTOX RIVER VALLEY. 13^ 



Mr. E. W. Berry has recently described" 14 species of plants from this bed 

 of which 6 are new. 



At 18th and Venable Streets in Richmond there is a layer of impure 

 glauconitic sand included in the Calvert drab clay. At its greatest thick- 

 ness the lenslike layer is 4 feet thick. The glauconite has undoubtedly 

 been derived from the Eocene which outcrops in the vicinity. 



At Howlett House Bluff the Calvert is well exposed as given on a pre- 

 ceding page and in several places near Chester. In the main it consists 

 of blue sandy clay with few fossil impressions. 



Calvert blue sandy clay overlying Eocene green sand is exposed in many 

 places along Bailey's Creek and on the James Eiver in the vicinity of 

 City Point. 



Section on right hanJc of James Biver just helow Blairs Wharf, eleven 

 and one-half miles helow City Point. 



Feet 

 Pleistocene Brownish-yellow stratified sand containing 



small amount of clay in certain layers, also a 



few thin iron bands and small pebbles 19 



Miocene. Calvert Drab exceedingly tough clay sharply separated 



from sand above. Clay near base is decidedly 

 blue. No fossils. Exposed to water 9 



Total 28 



SECTIONS IN THE APPOMATTOX RIVER VALLEY. 



The Calvert formation outcrops in many places along the tributaries of 

 the Appomattox Eiver and some of these localities are famous because of 

 the great numbers of fossils present. At Petersburg the formation out- 

 crops in the valley of Lieutenant Eun. Diatoms are abundant in certain 

 portions of the bed and have been described by microscopists. Numer- 

 ous molluscan fossils have also been obtained here as shown by the list given 

 on another page. One of the best sections exposed is the one that follows : 



Section in ravine near New Reservoir on Lieutenant Run. 



Feet 



Pleistocene Coarse cross-bedded and laminated buff to fer- 

 ruginous-brown sand with a rather persis- 

 tent band of ferruginous sandstone % to 1 

 foot in thickness near base 15 



Miocene. Calvert Blue sand containing fossil shells. Venus tridac- 



voidcs and Tiirritella especially abundant; 



shells very rotten 5 



Similar blue material without fossils 8 



Total 28 



oJour. Geol., vol. xvii, pp. 19-30. 



