VAUGHAN. 
EOCENE FORMATIONS. 
43 
Prospect drill No. 6, at Pilot much, 25 miles west of north from Santo Tomas, and 3 1-2 
miles from the Rio Grande — Continued. 
Depth. 
Material. 
Thiekness. 
Ft. in. Ft. in. 
80 0- 84 
84 0- 84 10 
84 10- 85 2 
2- 90 
85 
90 
91 11- 92 
92 3- 94 
94 
107 
117 
117 
118 
119 
125 
131 
145 
149 
153 
156 
168 
174 
176 
184 
208 
208 
210 
215 
216 
220 
220 
221 
227 
228 10-229 
229 0-230 
230 
232 
232 
236 
236 
8-232 
0-232 
6-236 
6-236 
8-237 
0- 91 11 
0-107 
0-117 
0-117 
6-118 
0-119 
0-125 
0-131 
0-145 
0-149 
0-153 
0-156 
0-168 
0-174 
0-176 
0-184 
0-208 
0-208 
6-210 
0-215 
0-216 
3-220 
0-220 
9-221 
0-227 
2-228 10 

Brown shale clay 
Coal 
Brown sandstone 
White sandstone 
Coal 
Bone 
Light-brown shale 
Tough shale 
Shale clay 
Bone 
Bony clay 
Bone 
Shale clay 
Sandstone 
Tough shale 
Sandstone 
Clayey sandstone 
Clay 
Shale clay 
Clayey sandstone 
Shale clay 
Sandstone 
Tough shale 
Bony coal 
Clay 
Brown sandstone 
Bony coal 
Brown shale clay 
Brown clayey sandstone 
Coal 
Brown sandstone 
Coal 
Bone 
Striped brown sandstone 
Bony coal 
Bone 
Blue shale clay 
Bone 
Coal 
Ft. in. 
4 
10 
4 
4 10 
1 11 

1 
13 
10 


1 
6 
6 
14 
4 
4 
3 
12 
6 
2 
8 
24 

1 
5 
1 
3 


6 
1 

1 
1 

4 


