’ 166 
' SECTION No. 6—Continued 
Section of the Coal Measures of the Forest of Dean 
Taken from the Memoirs of the Geological Survey, 1856, Vol. I. 
. Thickness | Distance pial 
Description of Measures ped betweun depth to 
inches | coal seam oh 
ft; am. |! fh ime figs 
21—Argillaceous and arenaceous shale | 135 0/ 1389 6 | 414 38 
22—Coal ... 0 6 
23-—-Under-clay ... 4.10 
24— Argillaceous shale 12 0) 165.6 a30eg 
25—Coal ... 0 8 
26—Under-clay Ses 4 0 
27—Arenaceous shale and sandstone ... 4 0 
28—Sandstone 2 i) 
29—Argillaceous shale 3 0 
30—Sandstone 5 0 
31—Gray argillaceous shale 6 0 
32—Red argillaceous shale L6G 
33 —Sandstone wes 4 9 
34 Greenish arenaceous shale ... ee) 
35—Argillaceous shale 30. (O 69 11 | 500 8 
36—Coal ... one ae anc cen hic OFS 
37—Under-clay ... sec nee cB 2 9 
38—Shale and sandstone. 468 Bes veel GL 0] — 94 “ba 5osmem 
39—Coal hk XG) 
40—Under-clay 1 6 2. 6 a9 aa 
41—Sandstone and shale.. 560 oa ay) tell th 
42—Argillaceous shale... x eealie, Land) 
43—Hard gray thick-bedded sandstone eel eo, JO 
44—Arenaceous shale... ext Soh SLU) SG, 
45—Sandstone ... ne ic 262 See ileal 
46—Coal (Crow Delf) ... Sh 53 “ioe 0 8] 234 8] 832 3 
47—Under-clay ... ec boi AGC 3 0 
48—Black argillaceous shale... aa cea? OU AO) 
49—Sandstone ... hic Sct a see ko) 0 
50—Coal and shale 500 sh ee fac ie 
51— Under-clay ... aes de Se 2Ge 3 0 
52—Argillaceous shale ... os 5 20 a0 
53—Black carbonaceous shale ... aes | 30 (0.| 91 2°) O25maa 
54—Coal (Dog Delf)... Adc 580 oe ee 
55—Under-clay ... eee an Yfic Be) 
56—Gray i Pee shale... 6 «| 44 OQ]. 4% 11 | Via 
57—Coal (Smith coal) ... 659 Au ste 2 6 
58—Under-clay ... pc ms ef ae an (0) 
59—Argillaceous shale ... oct ok | 29 0] 34 6 |1015 10 
