14

Fig, 17. Twomey Creek disturbances.. 241

18. Section of iron ore deposit four miles north of Timpson 249

19. Wolf Mountain sandstone 253

20. Faulted lignite bed 254

21. Section at Sulphur Spring, Rusk County 264

22. Ideal section of oil bearing region Nacogdoches County 274

23. Section one mile southeast of Fitze Station 282

24. Section near brickyard at Nacogdoches 283

25. Oil bearing greensand marl 284.

23, 24. Temnocheilus conchiferous 329

25, 26. Temnocheilus depressus 331

27, 28, 29. Temnocheilus crassus 333

30, 31, 32, 33. Metacoceras cavatiformis 334

34, 35. Metacoceras dubium 336

36, 37. Metacoceras walcotti 336

38, 39. Metacoceras hayi 339

40, 41. Metacoceras inconspicuum 340, 341

42, 43, 44. Tainoceras cavatum 341

45, 46, 47. Damatoceras umbilicatum 343, 344

48, 49. Asymptoceras newloni 346

50, 51. Phacoceras dumbli 347

52, 53, 54. Ephippioceras divisum 350

55, 56. Endolobus gibbosus 353

57, 58. Gastrioceras compressum 355

59. Gastrioceras compressum 355

60, 61. Hadrophyllum aplatus 552

62. Section through Northern Copper Field 579

63. Section crossing Mason Copper Field 581

64. Section crossing most southern Burnetian folds 583

65. Section of lead region of northwest Burnet County 585

66. Section of lead district north of Hye 586

67. Section crossing Caylor tract, Mason County 587

68. Complications in structure at eastern end of tin belt 601

69. Neighborhood of Shaft Mountain, Mason County 601

70. Spiller mine, Mason County 603