658 E. DeGOLYER 



At the Keechi dome the oldest outcropping formation is the 

 Austin chalk, and the Midway is said to be absent by unconformity. 

 The Texas Company has drilled five wells on the southeast flank 

 of the dome to depths of 3,170, 2,297, 2,656, 2,454, and 3,048 feet 

 respectively. These wells start in the Wilcox, some of them 

 penetrate the Woodbine, and possibly the first well passed through 

 the Woodbine. It is almost impossible to estimate the thickness 

 of the varous formations from the log of these wells. 



Near Freestone, about 22 miles S.SE. of the West Point dome, 



a well was drilled by the Freestone Syndicate, Inc., to a depth of 



2,370 feet. This well started in the lower Wilcox or Midway and 



was evidently in the Eagle Ford when abandoned. The log of 



this well, according to Lewis C. Chapman, who had the drilling 



under observation and supervised the collection of samples, was as 



follows : 



Well No. I, R. A. Tacker 



Thickness Depth 



Wilcox formation 624 624 



Midway formation 177 801 



Navarro and Taylor formations . . . 820 1,621 



Austin chalk 529 2,150 



Eagleford shales 220 2,370 



This determination is based altogether on lithologic character- 

 istics and is probably exact only for the Austin chalk. The 

 Nacatoch sand member of the Navarro formation is believed to 

 have been passed through from 1,196 to 1,215 feet. 



The most exact information regarding the thickness of the 

 various formations in this general region is the section given by 

 Matson^ and based chiefly on the log of a Magnolia Refining Com- 

 pany well at Corsicana, some 50 miles northwest of the West Point 

 dome. The various formation thicknesses given by him are as 

 follows : 



Navarro formation 1,650 feet 1 



Navarro and Taylor formations .... 135 feet [ 2,135 feet 



Taylor formation 350 feet J 



i\ustin chalk 425 feet 



Eagleford clay 370 feet 



Woodbine sand 400 feet plus 



' G. C. Matson, "Gas Prospects South and Southeast of Dallas," U.S. Geol. 

 Survey, Bull. 62g (1916), pp. 77-119. 



