DETAILED RECORDS. 271 
Feet. 
inn dark shale 474-510 
ard dark limestone 510-523 
irm dark shale 523-540 
ard white limestone 540-571 
irm dark shale. 571-610 
?ft brown shale. 610-670 
irm dark sandstone 670-690 
3ft dark shale 690-715 
3ft yellow shale 715-761 
ard gray sandstone 761-770 
aft dark shale 770-810 
3ft brown sandstone 810-830 
3ft dark shale 830-865 
iard gray sandstone 865-873 
3ft dark shale 873-885 
!ard gray sandstone. 885-896 
jrft brown shale 896-908 
^ard gray sandstone 908-940 
Rig used, cable. Casing used, 446 feet of 8|-inch; 940 feet of 6|-inch. Pressure of gas 
>und at 215 feet not tested. Salt water from 297 to 328 feet gave a flow of about 200 
lillons per minute. 
1566. Well near Dallas, Dallas County. 
well begun October 15, 1902; completed in January, 1904. Authority, J. M. Bassett, chief engineer 
Dallas waterworks. No samples. Geologic correlations checked by A. C. Veatch.] 
This deep well develops the so-called Trinity sand, which is a water-bearing bed of 
,^nd or sandstone near the base of the Lower Cretaceous (Comanche) series. The well 
arts in rocks of the Upper Cretaceous (Gulf) series. The formations penetrated are in 
3wnward order, Austin chalk, Eagle Ford shale, Woodbine sand, Denison, Fort Worth, 
'eston, and Goodland limestones, and Antler sands, the latter including water-bearing 
ids that are sometimes differentiated as the Paluxy, Glen Rose, and Trinity sands. 
Record of city well, 2 miles northwest of Dallas post-office. 
Feet. 
)il (and alluvium) 0- 90 
ustin chalk and Eagle Ford shale. 
Limestone 90- 760 
r oodbine: 
Sand ; water comes to surface 760- 780 
enison, Fort Worth, Preston, and Goodland: 
Blue shale 780- 900 
Limestone 900-1, 500 
Antlers sands: 
Paluxy sand; flow of good water, 150,000 gallons in twenty-four hours. . 1, 500-1, 580 
Soft marls with hard strata 1, 580-1, 890 
Blue shale 1, 890-1, 910 
White porous limestone; strong flow, 960,000 gallons in twenty-four 
hours; pressure 100 pounds; temperature, 96° 1, 910-1, 930 
Blue shale 1, 930-2, 180 
Sand ; another flow, same water 2, 180-2, 210 
Variegated clay and sand; no water 2, 210-2, 400 
Trinity sand; strong flow from 3^-inch hole and 4-inch casing; 640,000 
gallons in twenty-four hours; pressure, 125 pounds; temperature, 
100°; good water 2, 410-2, 585 
Rig used, rotary. Casing used, 1,013 feet of 8-inch; 600 feet of 6-inch; 700 feet of 
finch. Flow, 660 gallons per minute; quality, hard; too mineralized for boiler use. 
