232 RECORD OF DEEP- WELL DRILLING FOR 1905. 
Feet. 
Softer shaly rock \ 80- 90 
Hard blue rock 90-100 
Same rock, with quartz veins 100-1 15 
Hard light-blue rock (gray gneiss) 11 5-150 
Hard dark rock (gneiss). 150-160 
Hard light rock (fine gray gneiss or schist) 100-170 
Hard blue rock (dark-gray gneiss) 170-190 
Hard white rock (gneiss) containing iron 190-250 
Light-gray rock (gray gneiss) containing iron 250-265 
Soft dark-gray rock with iron 265-275 
Very hard dark-gray rock with some iron 275-280 
Hard light-gray rock with iron 280-290 
Hard dark-gray rock with iron 290-320 
Rig used, cable. Diameter of well, 8 and 6 inches. Length of casing, 26 feet. Well 
pumped 2 gallons per minute at 26 feet, 5 gallons at 45 feet, and 7 gallons from 60 to 160 
feet. Well was filled in from 320 to 280 feet, and in a forty-eight-hour test pumped 33.9 
gallons per minute. Temperature of water, 48.5° F. 
MARYLAND. 
674. Well al Annapolis, Ann*' Arundel County. 
[Well begun in 1904; completed in 190"). Authority, N. M. Shannahan, president J. H. K. Shannahar. J 
Artesian Well Company, contractor. Samples preserved. Geologic correlations by W. B.Clark.] 
This well obtains water from beds in the Potomac group. The formations penetrated 
in downward order, arc Aquia formation of the Pamunkcy group (Eocene) ; Matawan for 
mation (marine Cretaceous) ; Magol by formation ; and the Raritan and Patapsco formation: 
of the Potomac group (early Cretaceous). 
Record of well at United States Naval Academy, Annapolis. 
Recent: 
Made ground 
Aquia: 
Coarse orange-colored sand with some clay and bits of shells 
Coarse greenish to orange -colored sand with some clay 
Matawan : 
Fine greenish sand and dark clay 60-14 | 
Magothy : 
Very t ough drab clay 140-18 I 
Medium light-gray sand with streaks of light-colored clay; sand water-bear- 
ing, flowing water . 180-2S 1 
Raritan: 
Tough clay with fine white sand 220-2i 
Fine sand with flowing water 250-21 
Coarse water-bearing sand; flowing water 270-3( 
Tough red clay 306-3' ' 
Pink and red clay with coarse sand 3-40-31 1 
Coarse brownish sand ; water-bearing 360-4( ': 
Coarse light-buff sand; water-bearing 400-4 { 
Pink clay containing gravel 41 5-4 j 
Crust of iron ore 4 
Varicolored sand; water-bearing 43.5-4 j 
Crust of iron ore 4 
Varicolored sand; water-bearing 465-S 
Crust of iron ore 
Feet. 
0- 2 
20- 4 
40- 6 
