190 ARTESIAN WELLS ON THE ATLANTIC COAST. [bull. 138. 
ISLE OP WIGHT COUNTY. 
The wells to depths of 160 to 190 feet at Zuni on the Blackwater and 
at Mount Carmel Church, respectively, indicate an area of water in 
mid-Chesapeake beds which may be widespread, but of which the full 
extent can be determined only by further boring. The water is proba- 
bly at the same horizon as that at Franklin, at a depth of 130 feet. 
Notwithstanding the failure of the boring at Dendron, in Surry County, 
I believe there are some chances for basal Chesapeake waters through- 
out, and an almost certain prospect for them in the north, toward the 
Hog Island region, where they yield such large supplies. The Pamun- 
key and Potomac horizons remain to be tested, for no wells have yet 
been sunk to them. 
SOUTHAMPTON COUNTY. 
The Courtland and Franklin wells indicate the existence of two water 
horizons at moderate depths in this county. The Franklin water was 
not reported in the Courtland wells, where it should not be more than 
40 or 50 feet below the surface. The Courtland water has not been 
sunk to at Franklin, where it probably lies about 250 feet below the 
surface. The extent of these waters in the county is not known. The 
Arringdale water may be from the same horizon as that at Courtland, 
and if this is the case, it would be reasonable to expect it to be found 
throughout the intervening distance. The Potomac formation is proba- 
bly a water bearer in this county, but nothing can be promised for the 
Pamunkey formation, as it has not been studied. It is thought that a 
well to about 350 feet at Courtland would reach the basal Pamunkey 
beds. 
NANSEMOND COUNTY. 
No wells were reported from this county, and there are no data on 
which to base predictions, except for a few miles from Franklin in an 
area under which the Franklin water may reasonably be expected to 
extend. 
NORTH CAROLINA. 
GEOLOGIC FEATURES. 
All of the data for this State were supplied by Prof. J. A. Holmes, 
State geologist, and they are presented by him under the very conven- 
ient headings of counties. A general review of the horizons is not 
attempted at present, but for each county in the Coastal Plain region 
the well prospects are pointed out, so far as there is any evidence on 
which to base predictions. 
The general geologic structure of the Coastal Plain in North Caro- 
lina is indicated in the accompanying section by Professor Holmes, 
fig. 8. 
The principal difference in the geology of this region from that of 
Virginia is the reappearance of the marine Cretaceous beds, which 
