112 PHYSIOGRAPHY AND GEOLOGY OF THE COASTAL PLAIN PROVINCE. 



V. Section Mattaponi River eight miles below Burke's Bridge and one and 

 one-half miles ahove Reedy's Mill Bridge. 



Feet 

 Pleistocene ( ? ) Concealed about 22 



Miocene. Calvert In the upper part 10 or 15 feet of greenish 



clay with casts of Turritella plebeia and in 

 the lower part 6 or 8 feet of grayish argil- 

 laceous sand with a 1-foot grav«l band 

 along base containing quartz and phosphate 

 pebbles and sharks teeth. The pebbles are 

 all small 30 



Eocene. Nanjemoy Grayish glauconitic sand 5 



Concealed 2.3 



Total 80 



Eocene greensand appears at the base of low sections for the first 

 iy2 miles below Eeedy's Mill Bridge. The river then impinges on the 

 upland on the left and the following section is exposed. 



VI. Section left hanh of Mattaponi River, one and one-half miles below 



Reedy's Mill Bridge. 



Feet 

 Pleistocene ( ?) Concealed 20 



Miocene. Calvert Greenish clay with casts of Turritella; 



impure diatomaceous earth in lower part 24 

 Greenish argillaceous sand consisting prin- 

 cipally of reworked Eocene greensand with 

 a thin band of quartz pebbles, phosphate 

 pebbles, sharks teeth, and pieces of bones 

 more or less water- worn at base 10 



Eocene. Nanjemoy Greensand with some pelecypod casts 26 



Total 80 



VII. Section left bank of Mattaponi River two and one-half or three miles 



below Reedy's Mill Bridge. 



Feet 

 Pleistocene Concealed except gravel band at base 11 



Eocene. Nanjemoy Dark green arenaceous glauconitic clay with a 



band of water- worn fossil ^ near the base; J^d- 

 ericardia potapacoensis abundant; also Peo- 

 ten, Ostrea, Meretrix, etc 10 



Total 21 



