44 
RIO GRANDE COAL FIELDS OF TEXAS. 
[BULL. 164. 
Prospect drill No. 6, at Pilot ranch, 25 miles west of north from Santo Tomas, and 3 1-i 
miles from the Rio Grande — Continued. 
Depth. 
Material. 
Thickness. 
Ft. 
in. 

7 
6 

2 

8 

1 

7 

6 

Ft. 
237 
in. Ft. 
5-238 
238 0-244 
244 0-246 
246 
254 
255 
262 
0-254 
0-255 
0-262 
0-268 
Bone 
Sandstone 
Brown shale 
Brown sandstone. 
Blue shale clay . . . 
Sandstone 
Blue shale clay... 
Section at the Santo Tomas coal mine (Rio Grande Coal and Irrigation Company) . 1 
Ft. in. 
7. Carbonaceous shale roof; shale soft and requires considerable timbering. 
6. Good coal 14 
5. Bone 4 
4. Good coal 14 
3. Bone 6 
2 
Clay 
1. Sandstone. 
(See fig. 6, p. 54.) 
The Cannel Coal Company's mine is about 3 miles below Santo Tomas. 
Through the courtesy of Mr. D. D. Davis, the manager, the writer 
was enabled to make the following section: 
Section at mine of Cannel Coal Company, 3 miles below Santo Tomas. 
Ft. in. 
8. Clay slate or sandstone 14 
7. Carbonaceous shale £ 
6. Good coal 2 
5. Bone 15 
4. Clay.... 2 
3. Lower bench: 
c. Good coal 6 
b. Bone 2 
a. Good coal 11 
2. Carbonaceous shale 3 
1. Sandstone 14 
In this mine there is a small fault, and along the plane of the fault- 
ing there is a small sandstone dike. 
From prospect drill No. 2, between 83 and 90 feet, Mr. D. D. Davis 
had obtained and preserved some fossil mollusks, which he presented 
to the Survey. They were referred to Prof. G. D. Harris for deter- 
mination. He says they belong to an undescribed fuana, and has not 
yet furnished any identifications. 
'Mr. D. J. Roy, manager of this mine, rendered much assistance and showed us many courtesies 
while we were in Santo Tomas. It was through his kindness that we were enabled to examine the 
mine. 
