274 RECORD OF DEEP- WELL DRILLING FOR 1905. 
1620. Well at Schertz, Guadalupe County. 
[Well completed in 1903. Authority, J. P. Benkendorfer. driller. No samples.] 
Schertz is near the western corner of Guadalupe County, in a region that has not been 
mapped by the Survey. The formations penetrated by this well are believed to be included 
in the Upper and the Lower Cretaceous series. A water-bearing horizon at 325 feet may 
be in the Austin chalk and one at 830 feet in the Edwards formation. 
Record of well 300 feet east of Schertz post-office. 
Feet. 
Brown sand - 0- 6 
Red clay 6-16 
Concrete gravel 16- 32 
Yellow clay 32-46 
Blue clay - - - 46-261 
Magnesian limestone 261-301 
White limestone 20 feel : yellow limestone 5 feet ; gray limestone 89 feet 301-41£ 
"Lignite" 415-450.1 
Gray limestone 450-5H 
Blue mud ". 510-56,'J 
Blue limestone 60 feet : gray limestone 45 feet : blue limestone 50 feet 565-721 ' 
Gray limestone 82 feel ; white limestone 25 feet ; gray limestone 45 feet. 720-87! 
Casing used, 60 feel of 8-inch; 553 feet of 6-inch. Principal water bed at 830 feet ! 
another at 325 feet. Main supply is salt, sulphur water which rises within 50 feet c J 
surface. 
1(>:\>. Well near Saratoga, Hardin County. 
[Well begun December 22, L904; completed February 16, L905. Authority, II. 15. Goodrich, manage 
fuel-oil properties, GulfCoasI and Santa Fe Railway, owner. No samples.] 
This is an excellent log of a big gusher in the Saratoga pool. The oil-bearing rocks s 
this well, as of many others in the Coastal Plain region of southeastern Texas, are of Te! 
tiary age. They are overlain by clays, soft shales, and sands. Here and there the san n 
are consolidated enough to he sandstones, the sand grains being, in some cases, he 
together by a limy cement. Such thin beds of limy sandstone probably constitute mc 
of the "rock" reported by drillers. "(Jumbo*' is a Gulf coast name for sticky clay — bh 
gray, yellow, or mottled in color — sometimes containing hard, limy concretions. 
An account of the Saratoga and other oil pools is given in Bulletin No. 282, "Oil fie 
of the Texas-Louisiana Gulf coast," by X. M. Fenneman. 
Record if well No. J^A, in southeast corner of Petty tract, one-half mile east of Saratoga. 
Fee 
Surface sand 1- 
Red clay 10- 
Fine gray sand t 30- I 
Gumbo 115— 
Sand 128- 
Shale 161- 
Sand 184- 
Gumbo 230- 
Sand. 270- 
Gumbo - 279- : 
Sand 338- 1 
Soft rock 378- I 
Gumbo 380- 
