INDEX 



A. 



A. and M. College of Texas, xviii, xxv, xxvii, 



226. 

 Abilene, xxv. 

 Acknowledgments, lxxx. 

 Actinolite, 259, 379. 

 Adularia, 27 5, 379. 

 Advantages Trans-Pecos Texas, 231. 

 Agate, 225, 3*79. 

 Agava americana, 235. 

 Age of igneous irruptions, 263. 

 Agricultural soils, 137, 166, 191. 

 Agriculture, 226. 

 Alabaster, 225. 

 Alamo lignite, 35, 97. 



section, 35. 

 Albany, xxv. 

 Albertite, xl. 

 Albite, 259, 270, 379. 

 Algonkian system, 249, 252, 276. 

 Alice Eay mine, 223. 

 Allanite, 379. 



Allorisma subcuneata, 187. 

 Almandite, 259, 379. 

 Altered magnetites, 354. 

 Alternating beds, 121. 

 Alto, 67, 68, 88. 

 Alum Creek bluff, 30. 

 Alvarado, 109. 

 Alvin, xxxiii. 

 Amazon stone, 259, 379. 

 Ammonites leonensis, 128. 



pedernalis, 123. 



Rio Grande section, 38, 40, 41. 



texanus, 128. 

 Amphibole, 380. 

 Amphibolyte, 380. 

 Analyses of chalk, 113. 



clay ironstone, 84. 



iron ores, 84. 



lignites, 94, 98. 



marls, 94. 



soils, 37. 



Waldrip coal, 215. 

 Anderson County, xxvi, 34, 71, 91, 100, 101. 

 Andesite, 259, 270, 380. 

 Andradite, 259, 380. 

 Aneimite, 311. 



Angelina-Neches divide, elevation of, 71. 

 Angostora rapids, 41. 

 Anhydrite, hi. 

 Ankerite, 380. 

 Antelope Creek, 204. 

 Apache Mountains, 232, 234. 

 Apatite, 271, 380. 

 Aragonite, 122, 162, 225, 380. 

 Archaean group, lv, 249, 253, 255, 274, 277. 



sections, 270, 271, 272, 273. 

 Z 



Archseocidaris, 148. 



Archer County, 186, 196. 



Arenaceous division, 116. 



Argentite, 225. 



Arietina clays, 128. 



Arispa, 232. 



Arizona, 278, 279. 



Arkansas, 113. 



Arrott's Branch, 270, 271, 300. 



Artesian water, xxxiii, xlviii, lxxi, 111, 114, 



119, 170. 

 Asbestus, 259, 375 380,. 

 Assistant Geologists, lxxiv. 

 Atacamite, 225. 

 Athens, 97. 



clay, 90. 



section, 36. 

 Athyris subtiiita, 151. 

 Atlanta, 35. 



Aulopora serpuloides, 311. 

 Austin, xxvi, xlvii, 1, liv, 106, 107, 109, 110, 

 111, 112, 113, 119, 124, 126, 127, 128, 

 129, 130, 134, 314, 362, 368, 



Dallas chalk, xlvii, 112. 



marble, 127. 

 Aviculopecten costatus, 156. 



duplicatus, 311. 



occidentalis, 151. 

 Azurite, 225, 335, 380. 



Babyhead Creek, 331, 333, 336. 



district, 335, 364, 365. 



magnetite belt, lx, 349. 



Mountains, lv, lx, 258, 333, 349, 362. 



Postoffice, 338, 349. 

 Backbone Mountain, 246. 

 Balcones, liv, 117, 134. 

 Ballinger, 194. 

 Bare gneissic peaks, 258. 

 Barker, Mount, 133. 

 Barnes Hill, 78. 

 Barringer tract, 251, 345, 363. 



Hill, 262, 265, 267, 337, 363, 364. 

 Barton Creek Bluff, 52. 



Springs, 128. 

 Basal beds, 121. 



clays, Tertiary, xli, 19. 

 soils of, 21. 

 thickness of, 17. 



division, Comanche series, 118. 

 Base line, measurement of, lxxx. 

 Base metals, 334. 

 Bass Canyon, 232. 

 Bastrop County, 20. 



clay ironstone, 28. 



Colorado River, 28, 29, 30. 



lignite, 29. 



