DETAILED RECORDS. 207 
316. Well at Peru, La Salle County. 
[Well begun and completed in 1905. Authority, J. D. Kemp, driller. Samples preserved to 550 feet. 
Log compiled from samples by S. Sanford.] 
Several deep wells have been sunk near Peru, but the overlap of Carboniferous on much 
older rocks makes correlation of the well records difficult. The water-bearing stratum is 
apparently the base of the Trenton limestone (Ordovician). 
Record of city well at Peru. 
Feet. 
Soft brown shale, with limy streaks ■ 20- 40 
Soft red and gray shale with fragments of white limestone 40- 50 
Soft gray, slightly limy and micaceous shale. 50- 70 
Soft dark, slightly limy shale. . 70- 85 
Soft black shale 85-95 
Soft gray limy shale 95-110 
Soft gray limy and micaceous shale , 110-135 
Soft black shale, slightly limy 140-158 
Gray sandy limestone j 158-170 
Brownish sandy and slightly limy shale. 170-220 
Soft dark gritty shale with brownish limestone at base 220-255 
Brownish-gray limestone 255-285 
Dark gritty shale. 285-305 
Soft dark limy shale 30.5-350 
Brownish-gray impure limestone 350-375 
Brownish-gray limy shale 375-400 
Brownish-gray impure limestone 400-420 
Soft brownish-gray limestone to 480 feet, harder below 460-520 
White to brownish-gray granular cherty limestone 520-550 
Rig used, pole tools. Depth of well, 1,255 feet. Casing used, 14-inch, 52 to 355 feet; 
12-inch, 355 to 450 feet; 10-inch, 450 to 900 feet; 8-inch, 900 to 1,255 feet. Salt water at 
|700 to 750 feet. Principal water bed at 1,100 feet. Well flows 200 gallons per minute 
(and yields about 600 gallons by air lift. Static head, +85 feet. Temperature, 67° F. 
I "Coal No. 2 at Peru is mined at 314 feet, so that the bottom of the Coal Measures may 
jcome at 350 feet. The limestone below is probably Trenton. W 7 here the Coal Measures 
loutcrop but a short distance away, no such thickness of limestone is found as reported by 
his well from 220 to 285 feet."— G. H. Ashley. 
330. Well near Baylis, Pike County. 
Well begun November 3, 1905; completed November 14, 1905. Authority, A. .1. Cla rk, contractor and 
driller. Samples preserved] 
This is one of a group of three shallow wells drilled for gas. The rocks penetrated are all 
f Carboniferous age and are part of the Mississippian series, which, by the Illinois State 
Survey, was divided into St. Louis group, Keokuk group, Burlington limestone, and Kinder- 
100k group. The gas found by this well is thought to occur in the Burlington limestone. 
Record of well in the SE. \ sec. 1, f>\ miles south of Baylis. 
Feet. 
il and clay 14 
ight shale (soft dark-grayish shale) 14-1 1 5 
Dark shale (soft dark-brown, finely micaceous shale) ; strong odor 115-174 
Light shale like No. 2 (no sample) 174-182 
Limestone (white, more or less crystalline cherty limestone) 182-194 
'Sandstone (light-brownish, finely gritty limestone) containing gas, pressure 7 to 
8 pounds 194-214 
Limestone (white and light-brown, not crystalline). 214-215 
Ught shale like No. 2 (no sample) "..... 215-286 
Drab sandstone (finely gritty limestone) 286-312 
Rig used, cable tools. Diameter of casing, 7{ and 5| inches. 
