100 
INDEX. 
Page. 
Santo Tomas, reconnaissance between 
Uvalde, Carrizo Springs and 50-51 
record of prospect drill near 41-42 
Santo Tomas coal field, character of coal in 64-66 
extent of 62-63 
mines in 64 
Santo Tomas mine, section at 44 
Santo Tomas seam, section of 63 
Schirlitz, P., cited on occurrence of dacitic 
rhyolite 95 
Schott, A., work of 67 
Seibert, C, acknowledgments to 73 
Shelby County, analysis of lignite from 66 
Shoal Creek limestone. See Buda lime- 
stone. 
Stanton, T. W., aid by . . . . 11 
fossils collected by 45 
fossils determined by. 19-20, 22, 25, 26, 27, 29, 30 
notes on age of fossils by 82 
quoted on fossils from Salado Creek 29 
statement by 27 
work of 73 
Steeruwitz, W. H. von, cited on coal in 
Trans-Pecos Texas 86 
work of 74 
Steiger, G., analysis by 92 
Stevenson, J. J., cited on Cerillos coal field. . 11 
Taff, J. A., work of 71 
Taylor marls, character and thickness of . . . 34 
Tenne, C. A., cited on occurrence of tra- 
chyte 95 
Tertiary rocks, consideration of 37-55 
Texas, coal fields in New Mexico and 11-12 
Thompson, P. W., information furnished by 58 
Thompson, R., statement by 60 
Page. 
Trachyte, occurrence of 95 
Tulio Creek, fossil found at f 20 
Turkey Creek, compilations of sections 
along 32-33 
Upson, section near 20 
Upson clays, occurrence and character of . . 20-21 
variations in character of 34 
Uvalde, reconnaissance between Carrizo 
Springs, Santo Tomas, and 50-51 
Valverde flags. See Eagle Ford formation. 
Van Horn Creek, course of 74 
Vaughan , T. W. , reference to 88 
work of 72 
Vaughan, T. W., and Hill, R. T., cited on 
Anacacho formation 31 
cited on geology of Edwards Plateau and 
.Rio Grande Plain 54 
cited on Rio Grande Plain 13, 14 
cited on Taylor marls 34 
work of 72 
Vieja Mountains, coal in 86 
fossils from 78-79 
mountains composing 74 
plates showing views of 76, 78 
sections of 76-78, 79-8C 
structure of 7c 
I Volcanic outbursts, time of 8£ 
Webb bluff, section along Rio Grande from 
Laredo to 4( 
section of 3< 
' Well, artesian, at Eagle Pass, section of 11 
i White, C. A. , formation named by 2] 
fossils collected by 4; 
reference to 35, 39, 81 
work of 68, 7( 
O 
