25, 26. Magnified sections of coal-plant, lepidodendron 27. Section across Midland Coal-field 28. Vertical section of Derbyshire Coal-field between Chester 31. Section of gold-vein 32. Silver-lead vein: photograph showing ore and spar section of mineral vein 33. Water-worn cavity and mineral 34. Section of volcanic shaft 356 10 II 12 14 14 14 14 15 15 15 15 15 15 16 16 16 17 18 20 20 21 21 21 22 FIGURE 35. Section of salt-mine and strata 36. Section showing deposit of hæmatite ore 37. Section showing coal-measure ironstone 38. Section showing Oolite ironstone PAGE 26 26 27 28 57. Plan showing outcrop on hillside (case 6) EXPLORATION. 39. 40. Plan of estate, outcrops, quarries, shafts, etc. (case 1). 43. Plan showing "wash-out" Plan of estate, showing outcrops, etc. (case 2). 44. Section of above estate proved by digging, etc. 45. Excavation to prove strata 46. Section of hillside, showing rocky cliff 47. Sectional elevation of hillside with fault and spring 53. Section of above estate, showing faults and dips drawn to a "natural" scale 54. Plan of estate, showing outcrops, etc., etc. (case 5) . 55. Section of above estate from north to south, showing three faults. 56. Section from east to west, showing effect of fault 60. 58. Section on line x y, Fig. 57, showing hills, valleys, etc. 59. Section on line A B, Fig. 57 42 42 61. Section of above estate, showing anticlinal, etc. 62. Plan showing three veins (case 9) 63. Plan showing veins crossing (case 10) 69. Clinometer 70. Clinometer quadrant, graduated to show angles and per Plan showing estate partly covered by New Red Sandstone 42 42 43 44 45 45 45 46 46 47 47 47 48 48 49 50 52 |