FIG. 86.-MAP SHOWING UPPER CRETACEOUS WATERS. 0-0-Line where the base of the Upper Cretaceous passes below tide level. A-A-Line northwest of which the lower (Raritan) Upper Cretaceous waters are found within 500 feet of tide level. B-B-Line northwest of which the upper (Matawan, Monmouth) Upper Cretaceous waters are found within 500 feet of tide level. from a well 150 feet deep 15 gallons per minute are pumped; on the Severn River a short distance above Annapolis at 135 feet several wells flow 20 or more gallons per minute; at Eastport, Anne Arundel County, a well 218 feet deep flows 30 gallons per minute; at Tilghman and Sherwood, Calvert County, several wells at a depth of about 420 feet flow 8 to 15 gallons per minute and would probably yield a larger amount if pumped; west of Cambridge, Dorchester County, wells of about 500 feet in depth flow 3 to 6 gallons per minute. Quality. Very good, some iron present, with high temporary hardness. WATER FROM THE EOCENE DEPOSITS Water is found at two horizons in the Eocene, one in the lower and the other in the upper portions of the deposits. AQUIA FORMATION.-Abundant water near base and an important stream near top, the latter always heretofore known as Nanjemoy water. This name is continued for it throughout the present report in order to avoid confusion. It is discussed in the following paragraphs. NANJEMOY FORMATION.-The water is rather widely scattered through this formation; the only definite zone determined being one called Nanjemoy, but really in the upper part of the Aquia formation. Depth.-75 to 500 feet. Static Head.-From 40 feet below to 5 fect above the surface; a few flowing wells; generally pumped by suction pumps. Quantity. Large and small. Many wells of small size are found, among them four wells at Millington, Kent County, 100 feet in depth which yield by pumping 10 gallons per minute; a well at Eastport, Anne Arundel County, 70 feet in depth which yields 8 gallons per minute, and others at Churchton, Deal, Shadyside, and Galesville, Anne Arundel County, which at depths of 90 to 130 feet flow 2 to 5 gallons per minute, which could probably be much increased by pumping; a well at Tompkinsville, Charles County, which at a depth of 265 feet flows 3 gallons per minute; and numerous wells near Madison and Woolford, Dorchester County, 0-0-Line where the base of the Eocene passes below tide level. A-A-Line northwest of which Eocene waters (Aquia and Nanjemoy) are found within 500 feet of tide level. which at depths of 300 to 350 feet flow 1 to 2 gallons per minute and could undoubtedly yield 30 to 40 gallons per minute by pumping. Of wells of somewhat larger yields at the present time may be mentioned one at Oxford, Talbot County, 350 feet deep which yields by pumping 25 gallons per minute, another at Greensboro, Caroline County, 240 feet in depth which yields 30 to 35 gallons per minute; and one at Queen Anne, Queen Anne's County, of the same depth and about the same capacity. A number of wells of much larger yield have been drilled, among them one at Benedict, Charles County, 345 feet deep which flows 45 gallons per minute, and would show a very much larger capacity if pumped; a well at Denton, Caroline County, with a depth of 285 feet which yields by pumping 75 gallons per minute; and a well at the Eastern Shore State Hospital at Cambridge, Dorchester County, 390 feet deep from which 190 gallons per minute are pumped by means of an air compressor with two jets, the lower 175 feet below the surface. Quality.-Good, although frequently hard; at times sandy. WATER FROM THE LOWER MIOCENE DEPOSITS Water is obtainable from the Lower Miocene deposits in a belt about 45 miles in width at depths less than 500 feet. CALVERT FORMATION.-The water horizon of the Calvert formation is located above the top of the basal diatomaceous earth member and extends from about 35 or 40 feet to 75 feet above the base of the formation. Depth. From 50 to 500 feet, the shallower wells near the outcrop yielding small quantities of water. The chief supplies are secured at about 300 feet in depth. Static Head.-Generally from 30 feet below to 10 feet above the surface, an extreme head of 20 feet above sea level having been observed. Quantity.-Large and small. Among small wells which derive their water from this horizon may be mentioned several at Chesapeake Beach, Calvert County, 125 feet in depth which flow 2 gallons per minute, and another at Oxford, Talbot County, 130 feet deep which yields 10 gallons per minute by pumping. Somewhat larger supplies have been secured at Solomons Island, Calvert County, where wells 265 feet in depth flow |