98 
INDEX. 
Page. 
Durable, E. T., cited on Eocene fossils 38 
cited on fault near San Carlos 75 
cited on quality of coal found near 
Uvalde 62 
cited on section at Webb bluff 39 
cited on thickness of Austin chalk 
beds 20 
cited on thickness of Eagle Ford form- 
ation 19 
cited on time of volcanic outbursts 83 
cited on value of lignite 66 
formations described by 26 
quoted on Upson clays 20 
quoted on San Miguel beds 21-22 
reference to 19, 21, 22, 35, 82 
section given by. . ." 78 
works of 70, 71-72, 74 
Eagle Ford formation, occurrence and char- 
acter of 18-19 
Eagle Pass, character and constitution of 
coal from 60 
fossils found near 22, 26, 27, 30 
map showing coal mines and prospects 
near 56 
plate showing bluff of Rio Grande at. . . 54 
plate showing view of Rio Grande op- 
posite 26 
rainfall and temperature at 15 
reconnaissance between Carrizo Springs 
and 30-31, 46-47 
reconnaissance from Cline to 2S-30 
relation of Cretaceous to Eocene be- 
tween Carrizo Springs and 3.5-36 
section of artesian well near 25 
sections near 22, 23, 26, 30, 57-58 
thickness of coal bed near 57 
Eagle Pass coal fields, consideration of 13-61 
climatic conditions of 15 
descriptive geology of 1.5-55 
extent of 55 
limits of 13 
map of 13 
mines in 60 
physical features of 13-15 
vegetation in 14-15 
Eagle Pass formation, fossils found in. 22, 25-26, 27 
section of 34 
thickness, occurrence, and character of. 21-28 
variations in thickness of 35 
Edwards limestone, exposures of 16 
fossils found in 84 
Elm Creek, figure showing section of hill on. 23 
Engelmann ranch, section near 51 
Eocene, course of boundary between Cre- 
taceous and 53 
conclusions regarding 53-54 
plate showing contact of Cretaceous 
and 50 
plates showing exposures of 50, 52 
relation of Cretaceous to 35 
r^sumtS of section of 45 
thickness in Uvalde quadrangle 53 
Eocene coal fields, extent of 61-62 
Eocene rocks, consideration of 37-54 
Escondido beds, description of 26-28 
fossils found in 26-27 
Fireman, P. , analyses by 60, 64, 65, 87 
Pas 
Foerstner. H., cited on pantellerite 92 
Fort Clark, rainfall and temperature at 
Fort Inge, rainfall and temperature at 
Fort Worth limestone, fossils found in 16 
occurrence and character of 
Frazier, S. D., information furnished by. . . . 
reference to 
Frio River, fossils found on 
plates showing Eocene and Cretaceous 
rocks on 50 
relation of Cretaceous to Eocene along. 
sections of Eocene on 51 
Fuente mines, Mex., section at 
thickness of coal seam in 
Gemmellaro, C, cited on pantellerite 
Gettysburg Peak, plate showing view of 
sections of si 
Gobbett survey, section of well on 
Greely, A. W., cited on climatic conditions 
of Texas 
Guajolote ranch, sections at and near 39 
Habey ranch, sections near 
Harris G. D., cited on Eocene fossils 
cited on relation of Cretaceous to Eo- 
cene in Rio Grande section 
quoted on fossils found near Eagle Pass. 
reference to 
work of 7] 
Hartz mine, thickness of coal at 28 
Hector, O. P., information furnished by 
Herman, G. C, information furnished by.. 
Hill, R. T., cited on " Balcones escarp- 
ment " 
cited on coal in Chisos Mountains 
cited on constitution of coal in Santa 
Rosa region 
cited on Eagle Ford formation 
cited on Santa Rosa coal field 
letter of transmittal by 
reference to 11. 6: 
work of 68, 69-71 
Hill, R. T., and Vaughan, T. W., cited on 
Anacacho formation 
cited on geology of Edwards Plateau and 
Rio Grande Plain 
cited on Rio Grande Plain. l; 
cited on Taylor marls 
work of 
Hills, R. C. cited on coal from Colorado l: 
Hitchcock, C. H., work of 
Hobbs, W, H., cited on occurrence of vol- 
canite 
Igneous rocks, report on & 
India ranch, fossils found near 
Johnson, S. A., acknowledgments to 
information furnished by 
Johnstone, elevation at 
Knowlton, F. H., fossils determined by . . 23. 4. 
notes by 
reference to 
Laredo, analysis of coal from 
rainfall and temperature at 
section along Rio Grande from Webb 
bluffto 
Las Moros Creek. See Tulio Creek. 
reference to 2 
Leon County, analysis of lignite from 
