DETAILED RECORDS. 213 
Top of oil sand (compact black sandy shale and medium to fine brown sand- Feet. 
stone, slightly limy). . . . 1, 130-1, 135 
( )il sand (same sandstone, with smaller proportion of black shale) 1 , 135-1 , 173 
Rig used, cable. Length of casing, 1,100 feet. Water-bearing strata from 30 to 40, 
300 to 450, and 700 to 750 feet. Initial yield of oil, 20 barrels in twenty-four hours. 
422. Well at Davis, Chickasaw Nation. 
[Well begun May 24, 1905; completed August 2, 1905. Authority, Jolly & Hahn, contractors. No 
samples.] 
The formations penetrated belong to the "red beds," which are generally referred to 
the Permian series of the Carboniferous system. The record shows the alternations of red 
mud (soft shale), red and blue slate (gritty shale), limestone, and sandstone that are 
characteristic of the "red beds." 
The geology of the Arbuckle Mountains and the adjacent "red beds" is discussed in 
Professional Paper No. 31, "Geology of the Arbuckle and Wichita mountains," by J. A. 
Taff. 
Record of well at Davis. 
Feet. 
Red mud; cavey place to drill 0- 25 
Gravel 25-30 
Red mud and sand 25- 55 
Gravel 55-60 
Red mud 60-90 
Limestone 90-105 
Red and light-red mud . 105-225 
White and gray limestone 225-250 
Red slate 250-255 
Limestone 255-260 
Red slate 260-265 
Blue slate 265-300 
Blue limestone 300-305 
Blue slate 305-330 
Red slate 330-370 
Red limestone 370-395 
Red mud 395-430 
Hard limestone 430-440 
Gray sand 440-455 
Red mud 455-475 
Red sandstone 475-485 
Red clay 485-500 
Sandstone and red sandstone 500-525 
Red slate 525-535 
Blue slate 535-540 
Sand 540-555 
Red slate. 555-580 
Sandstone 580-600 
Blue slate . 600-610 
White slate 610-620 
Red slate 620-640 
Blue slate 640-650 
Red slate 650-680 
Sandstone "_ 680-700 
Blue slate 700-705 
White slate 705-710 
