DUBNFORD : DEEP BORING NEAR SELBY. 
345 
No. 
Description of Strata. 
Trias — continued. 
24. Red marl 
25. Gypsum ... 
26. Gypsum ... ... 
27. Anhydrite 
28. Anhydrite 
29. Red marl : friable 
30. Marl and gypsum-bands 
31. Red marl : friable 
32. Marl, with bands of gypsum ... 
Thickness of 
Strata. 
Ft. In. 
34 0 
2 0 
13 0 
0 6 
5 0 
16 6 
4 0 
Depth from 
Surface. 
Ft. In. 
754 
756 
757 
761 
774 
774 
779 
796 
800 
Magnesian Limestone. 
33. Limestone, 
with bands of gypsum ... 
16 
0 .. 
816 
0 
34. Limestone 
4 
0 .. 
820 
0 
35. Limestone 
35 
6 .. 
855 
6 
36. Limestone : 
jointy 
38 
0 .. 
893 
6 
37. Limestone, 
with bands of shale and gypsimi 
10 
0 .. 
903 
6 
38. Red marl, with layers of limestone ... 
64 
0 .. 
967 
6 
39. Rock-salt 
20 
0 .. 
987 
6 
40. Limestone 
20 
6 .. 
. 1,008 
0 
41. Blue marl 
1 
0 .. 
. 1,009 
0 
42. Anhydrite 
5 
6 .. 
. 1,014 
6 
43. Blue marl 
1 
0 .. 
. 1,015 
6 
44. Limestone 
4 
6 .. 
. 1,020 
0 
45. Red marl 
1 
0 .. 
. 1,021 
0 
46. Limestone 
25 
6 .. 
. 1,046 
6 
47. Limestone, 
with veins of gypsum ... 
45 
0 .. 
. 1,091 
6 
48. Limestone 
137 
6 .. 
. 1,229" 
0 
49. Limestone : 
honeycombed and jointy 
35 
0 .. 
. 1,264 
0 
50. Limestone 
41 
0 ., 
.. 1,305 
0 
Coal Measures. 
51. Grey shale 
12 
0 .. 
. 1,317 
0 
52. Blvie shale 
2 
0 .. 
. 1,319 
0 
53. Blue shale 
29 
0 .. 
. 1,348 
0 
54. Grey shale 
28 
0 .. 
. 1,376 
0 
55. Dark shale 
18 
0 .. 
. 1,394 
0 
56. Blue shale 
12 
0 .. 
. 1,406 
0 
57. Sandstone and sandy shale, with coal veins 
15 
0 .. 
. 1,421 
0 
58. Blue shale, with sandstone layers ... 
19 
0 .. 
. 1,440 
0 
59. Blue shale 
60 
0 
.. 1,500 
0 
60. Fire-clay... 
1 
0 .. 
. 1,501 
0 
61. Blue shale 
18 
0 .. 
,. 1,519 
0 
62. Light-coloured sandy shale 
7 
0 .. 
. 1,523 
0 
63. Blue shale 
45 
0 .. 
,. 1,571 
0 
64. Grey shale 
6 
0 .. 
1,577 
0 
65. Dark-coloured shale, ^^th ironstone nodules 
7 
6 .. 
,. 1,584 
6 
66. Sandy shale 
4 
6 .. 
,. 1,589 
0 
67. Dark-blue shale 
26 
0 .. 
,. 1,615 
0 
68. COAL 
1 
3 
,. 1,616 
3 
69. Fire-clay... 
4 
0 .. 
.. 1.620 
3 
70. Blue shale 
29 
9 .. 
,. 1,650 
0 
71. Grey shale and sandstone layers 
32 
0 ., 
,. 1,682 
0 
72. Blue shale 
9 
0 ., 
,. 1,691 
0 
