188 RECORD OF DEEP- WELL DRILLING FOR 1905. 
Feet. 
Yellow sandy clay. 80- 95 
Blue sandy clay - - - 95-106 
Blue clay - 106-115 
Blue cement clay 115-136 
Blue clay 136-143 
Blue sand. 143-147 
Blue joint clay 147-150 
Blue clay. 150-160 
Blue sand 160-170 
Cement gravel 170-172 
Washed gravel 172-182 
Yellow clay 182-194 
Yellow sand 194-198 
Blue silt 198-220 
Blue clay 220-237 
Gravel : 237-242 
Yellow clay 242-253 
Blue silt 253-265 
White limestone 265-269 
Hard sand 269-275 
Blue sand 275-281 
Gravel 281-293 
Yellow clay 293-294 
'Gravel. 294-310 
Yellow clay. 310-350 
Limestone 350-364 
Sand and gravel 364-371 
Yellow clay 371-425 
Rig used, hand tools. Diameter of well. 12 inches. Water-bearing strata at 71 74, 
143-147, 160-170, 194-198, 237-242, 269-293, 294-310, and 364-371 feet. The supply of 
water obtained was small and the well was considered a failure. 
94. ^Vell near Coalinga, Fresno County. 
[Well begun April 26, 190.">; completed August 1, 1905. Authority, Besley Lefevcr, contractor and 
driller. No samples.] 
The oil-bearing horizons in the main Coalinga field occur at the base of a great series of 
sandstones, conglomerates, shales, and clays which range from the lower Miocene to the 
upper Pliocene. 
Record of well in the N. J NW. \ sec. 7, T. 20, R. 15, 6 miles northwest of Coalinga. 
Feet. ] 
Soft gray sand rock 0- 40 
Hard yellow conglomerate 40- 150 
Soft blue clay. 150- 170 
Hard gray sand rock 170- 180" 
Soft sand, water bearing; first water. 180- 190 
Conglomerate full of hard pebbles 190- 250 
Soft sandy black shale 250- 275 
Sand with hard streaks; water-bearing 275- 300 
Sand and blue clay; water-bearing 300- 350 
Very hard gray sand rock 350- 353 
Soft brown shale 353- 375 
Soft sand; water-bearing 37.5- 385 
