darton.] VIRGINIA. 189 
on the Eastern Shore of Virginia. The wells at Crisfield, Md., were 
bored to a depth of 1,016 feet before a water supply was found, and 
this demonstrated that for the Crisfield region, at least, there are no 
basal Chesapeake or Pamunkey waters. The water found at Crisfield 
may be expected with some degree of confidence in Accomac and 
Northampton counties at about 1,100 feet below the surface. There 
is also a possibility of even lower water in basal Potomac beds a few 
hundred feet deeper. 
EASTERN HENRICO COUNTY. 
The city of Richmond and the region eastward are underlain by the 
Potomac, the Pamunkey, and the Chesapeake formations, of which the 
western limit is in the western part of Eichmond. The Potomac forma- 
tion lies on the floor of granite which passes beneath tide- water level 
in Eichmond, and contains water to the eastward, but the basal 
Pamunkey and the Chesapeake formations lie above tide level to the 
east line of the county, and the water that they contain farther east is, 
in some measure at least, free to flow out into the James Eiver. The 
relations in the region are shown in section 4 of PI. XVI. The only 
wells I know of in the county are in or near Eichmond, and these are 
mainly in the granite. A list of them is given on page 166, and some 
further statements regarding them may be found on page 178. 
EASTERN CHESTERFIELD COUNTY. 
In the portion of this county that lies east of the Eichmond and 
Petersburg Eailroad water may be expected in the basal Potomac sands 
at depths from 100 to 250 feet. I know of no deep wells in that section. 
PRINCE GEORGE AND SUSSEX COUNTIES. 
These counties are underlain by the Potomac, Pamunkey, and Chesa- 
peake formations, and probably these members will be found to carry 
the usual water-bearing beds as in the adjoining region. No wells have 
been reported, but the geologic relations have been studied and the 
regular succession of beds and conditions for water found to prevail. 
The approximate distribution of the water-bearing beds is shown in 
the map, PI. XV. 
SURRY COUNTY. 
The very successful group of wells at Homewood, on Hog Island, are 
in this county, and they and the Jamestown well give a good basis for 
the belief that the basal Chesapeake waters will be found in a wide 
area to the south and west. The Dendron boring, however, may indi- 
cate a restriction of this area. The underlying Pamunkey horizon has 
not been tested, and the chances for water in it are sufficient to warrant 
a boring. Its relations are shown in section 4 of PI. XVI. 
