vaughan.] EAGLE PASS COAL FIELD. 61 
Penrose gives the following- analysis of the Eagle Pass eoal i 1 
Analysis of Eat /If Pass coal. 
Per cent. 
Water 
Volatile matter 
Fixed carbon . 
Ash 
Sulphur 
3.675 
39. 42 
41.7 
15. 205 
0.81 
The following data concerning some of the coal of the Santa Rosa 
region are extracted from a paper by Hill, 2 in which he states that, 
according to Professor Rock, the following is an analysis of that coal: 
Analysis of coal from Santa Rosa region. 
Moisture 
5.75 
77. 147 
3.53 
1.41 
73. 617 
17. 103 
4.3 
Coke 
Ash 
Specific gravity 
By computation this coal should have — 
Fixed carbon 
Volatile hydrocarbon (approximately) 
Ratio R C - X 
V. H. C.J 
In the ash, silica and iron predominate. No coal so good as the 
Mexican article has yet been discovered in Texas. 
EOCENE COAL FIELDS. 
EXTENT OF THE EOCENE COAL FIELDS, INCLUDING THE SANTO TOMAS 
FIELD. 
The most northern exposure of lignite observed in this region is that 
in the east bank of the Nueces River at the north line of Zavalla 
County, about a half mile below the Pulliam ranch. When this local- 
ity was visited about 2 feet of coal were exposed. Owen makes the 
following note on this outcrop: 
Fourteen miles southwest of Uvalde, on the line between Uvalde and Zavalla 
counties, there is an outcrop of coal in the north bank of the Nueces River. At 
this place the stratum is 4 feet 10 inches thick, with a 3-inch division of slate in 
the center. 3 
i First Ann. Rept. Geol. Survey of Texas, 1890, p. 98. 
2 Report to Ministro de Fomento upon the geology of the Santa Rosa mining district. 
3 First Rept. of Progress of Texas Geol. Survey, 1889, p. 69. 
