DARTON.] 
MARYLAND. 
143 
appears to extend to Seawall, South Baltimore (Curtis Bay), and Col- 
gate Creek, and is probably the source of water in the Northern Cen- 
tral Elevator well (foot of Thirteenth street) and of the water at 100-114 
feet in the copper works wells. The following analysis is given of the 
water of this horizon from the well at the old copper works from a depth 
of 100 feet. In this well there is probably some surface contamination, 
for the soil is deeply saturated with acid. 
Analysis of water in well at copper works. 
Chlorine 
Sodium 
Magnesium 
Calcium 
Sulphuric acid 
Total 
Reaction distinctly acid 
Grains per 
gallon. 
0.62 
0.41 
0.64 
0.35 
0.00 
2.02 
Another horizon, D, about 40 feet higher, is found at the old Copper 
Works, the Electric Copper Works, the Baltimore Guano Works, and 
possibly in other wells, but it has not been well explored, and 1 under- 
stand that the water is subject to surface contaminations to the north- 
ward, where it lies only 50 feet deep. 
The only well record which I obtained for the Canton region is a par- 
tial one for the well 198 feet deep at the Northern Central Bailroad 
power house at Tenth street and Fifth avenue. It is as follows : 
Feet, 
0-18 sand. 
18-19 gravel. 
19-45 sand. 
45-47 clay. 
47-67 sand, with slight admixture of clay. 
67-69 coarse sand and gravel, with water. 
69. . thin hed of compact sand underlain hy thin bed of clay. 
69-170 fine sand, with occasional very thin gravel beds. 
170- ? thin clay bed, 2 feet of gravel with slight water yield, three 
feet of very hard clay. 
198 clean coarse gravel, yielding 100 gallons of water per minute. 
The last is probably the basal gravel of the Potomac formation, or 
Horizon A. 
There are several wells in the upper portion of Canton, known as 
Highlandtown, which yield large water supplies. At the National 
Brewery there are two wells to 210 and 450 feet, and at Gunther's 
Brewery two wells to 207 and 208 feet. No records of these wells 
could be obtained, but it was stated that rock was noted at 240 feet. 
The waters at 207 and 240 feet are probably in basal Potomac beds, or 
Horizon A, as shown in section 1, PI. VIII. At Schluderberg's Pack- 
ing House, seven blocks north of these breweries, a well was bored to 
