144 ARTESIAN WELLS Otf THE ATLANTIC COAST. [bull. 138. 
over 408 feet which yields 100 gallons a minute. Sand rock was 
reported at 216 feet, "granite" at about 230 feet, limestone from 360 to 
385 feet, and then the " granite" again to 408 feet. Water was found at 
135, 160, and 210 feet, and the 160-foot, or B horizon, was tested to 
150 gallons a minute. The identification of the sand rock and of the 
top of granite in the boring is too unreliable to positively determine 
the location of the basal beds of the Potomac formation, but they 
probably carry the water found at 210 feet. 
Southern Baltimore, from Canton to the Basin. — These wells are mainly 
along or near Boston street and on the eastern side of Fells Point. 
There are only a few in the vicinity of Jones Falls, and they are not 
very successful. From the foot of Patuxent street to Ann street there 
are 25 wells, nearly all of which are large producers of excellent water. 
Some are very old and others have been recently bored. The average 
depth is between 80 and 120 feet, and the principal water horizon is 
B of the Canton region, but A and O also are found. Locations of 
wells and contour of the lower water horizon are shown in the map, 
PI. VII. Section 2 of PI. VIII illustrates the principal relations. This 
section is from the Basin across Fells Point and eastward along or 
near Boston street to East avenue and thence to the Electric Copper 
Works, looking north. 
The wells at the ice works on South Wolfe street, near Fell, form 
an interesting group which quite clearly exhibits the relations in the 
region. The well borer kindly furnished me with data regarding them, 
including the following record : 
Feet. 
0-25 filling. 
25-30 black mud. 
35-42 pinkish clay. 
42-47 sand and gray gravel, with brackish water. 
47-95 clay of various colors : pink, gray, red, yellow, etc. 
95-97 . . sand and gravel, with large supply of good water. 
97-155 clay of various colors and a few sandy streaks. 
155-157 gravel and sand, with large supply of good water. 
157 hard black rock, which was penetrated to 317 feet without 
finding water. 
The large water supply found in the basal Potomac beds, Horizon A, 
appears to extend to the north and west, but it was not reported in the 
Tyler well, half a mile southeast. The greater number of the wells in 
this district find abundance of water in the B horizon about 40 feet 
above the basal beds. This water has yielded a large supply at the ice 
works wells at a depth of 97 feet and in several wells in that vicinity, 
but it has not been traced to the westward. In the 60-foot well at the 
Norton Tin Works and in the 93-foot well at Fait & SlageFs a higher 
water horizon was found, which appears to be the C horizon of the 
Canton region. It was not, however, reported in wells lying between 
these two localities, nor in the wells to the westward. Possibly the 
C horizon is the one that yields water at the potteries, corner of 
Canton aud Central avenues, at a depth of 45 feet. The several wells 
