150 ARTESIAN WELLS ON THE ATLANTIC COAST. [bull. 138. 
Delaware, and although not extensively tested in southern Maryland 
they probably underlie a considerable area of the Eastern Shore. At 
Easton the large water supply in wells 100 feet deep is from a horizon 
in the Chesapeake formation about 150 feet above its base, and the 
Federalsburg water from a depth of 231 feet is either in the same horizon 
or in one not a great distance above. The small showing of water at 
160 feet at Leonardtown appears to be a local occurrence, for it was not 
reported in other wells to the eastward. The unsatisfactory water at 
Salisbury is from a much higher horizon, and the flow of fine water at 
Ocean City is still farther up in the Chesapeake formation. In the 
wells at and near Cambridge and at Crisfield no waters were reported 
above the basal Chespeake beds; so we must conclude that the higher 
waters do not extend in that direction. 
PROSPECTS, BY COUNTIES, IN EASTERN AND SOUTHERN MARYLAND. 1 
ANNE ARUNDEL COUNTY. 
In the northern portion of this county water may be found at mod- 
erate depth in the various beds in the middle and lower portion of the 
Potomac formation. The wells at Seawall found Potomac water at a 
depth of about 200 feet, or about 80 feet above the base of the forma- 
tion. The depths increase rapidly to the eastward; and along a line 
extending from Bodkin Point, at the mouth of the Patapsco River, by 
the heads of the Magothy and Severn rivers and Millersville to the 
forks of the Patuxent River, the base of the formation is about 600 feet 
below tide- water level. Water may also be looked for in the southern 
extension of the formation as far as the southern edge of the county, 
where the basal beds sink to about 1,300 feet below tide-level. There 
are prospects for water in beds at various horizons in the lower half of 
the formation, but as yet they can not be definitely predicted. At 
Bay Ridge a mid-Potomac horizon was found at a depth of 470 feet, 
which may extend widely to the westward. In the vicinity of Annapo- 
lis water may be expected in the same horizon as that which is tapped 
by the 208-foot well at Annapolis. This water probably underlies all 
the lower portion of the neck between the Magothy and Severn rivers, 
at a somewhat less depth than at Annapolis, for the beds rise to the 
north and west. The same waters may probably be expected in the 
Davidsonville region, in the Patuxent Valley, about West and Rhode 
rivers, and near Herring Bay, at a depth which increases at the rate of 
25 feet per mile to the southeastward. 
CALVERT COUNTY. 
This county is probably underlain throughout by the water which is 
obtained in the wells at Solomons Island, at the base of the Chesa- 
peake formation, at a depth of about 250 feet. The depth decreases at 
the rate of about 9 or 10 feet per mile northward from Drum Point, and 
1 Exclusive of Baltimore County, which, is treated on pages 142-148. 
