24 
RIO GRANDE COAL FIELDS OF TEXAS. 
[bull. 164. 
Section at mine No. 1 of the Fuenie, Mexico, coal mines onihe north bank of the Rio Escon- 
dido, 5 or 6 miles west of Eagle Pass. 
Feet. 
6. Gravel interstratified with sandy clay resting uncomformably on (5) 15-20 
5. Bluish or yellowish carbonaceous clay 5 
4. Shaly coal 4 
3. Reddish and bluish clay 2 
2. Coal (worked seam) 4-5 
1. Clay. 
Total 30-36 
Near this mine a conglomerate, composed of calcareous pebbles and 
calcareous cement, covers the surface between the arroyos. 
Prospect shaft No. S of L. F. Dolch <£* Co. , near coed, shaft for mine. 
Depth. 
Material. 
Thickness. 
Feet. 
0-64 
64-74 
74-91 
91-93 
93-96 
96-100 
100-104 
104-120 
120-126 
126-132 
132-145 
145-148 
148-151 
151 
151-176 
176-1 76 J 
176^-181 
181-182 
182-183 
183-183^ 
183^-195 
195-198 
198-199 
199-201 
201-203 
203-210 
Clay 
Sandstone 
Black clay 
Septaria in clay 
Hard blue sandstone 
Very hard brownish clay, with some sand 
Blue argillaceous sandstone, with some clay seams 
Dark bluish-black slate 
Hard sandstone 
Dark slate 
Black clay 
Sandstone 
Brown clay, rather hard (had to be blasted) 
Coal 
Very hard white sandstone 
Bony coal 
Clay 
Brown slate : 
Bony coal 
Coal seam 
Clay 
Slate and sandstone 
Bony slate 
Sandstone 
Bone 
Coal 
Ft. in. 
64 
10 
16 
6 
6 
13 
3 
3 
2 
25 
6 
1 


6 
1 
6 
3 

1 

2 

9 

7 

