20
SOUTH STAFFORDSHIRE.
As a more easily remembered key to the structure of the district than that of the general section it may be as well to give the following abstract list of the principal workable coals in the southern district in descending order:—
FT. | |||
Upper measures, maximum thickness | about | 800 | |
1. | Brooch coal | about | 4 |
Intermediate measures varying in 25 pit sections from 87 to 218 feet | mean | 130 | |
2. | Thick coal | about | 30 |
Intermediate measures varying in 33 pit sections from 7 to 35 feet | the mean being | 20 | |
3. | Heathen coal | about | 4 |
Intermediate measures varying in 33 pit sections from 56 to 144 feet | the mean being | 109 | |
4. | New Mine coal | about | 8 |
Intermediate measures varying in 43 pit sections from 2 feet to 35 feet | the mean being | 16 | |
5. | Fire-clay coal | about | 7 |
Intermediate measures varying in 40 pit sections from 18 to 52 feet | the mean being | 30 | |
6. | Bottom coal | about | 12 |
Lower measures | maximum proved thickness | 140 | |
1,310 |
This total of 1,300 feet is probably greater than the thickness of Coal-measures that ever existed at any one place in the southern half of the South Staffordshire coal-field.
General Section of the Central and Southern Part of the Coal Field.
FT. | . | FT | |||||||||||
1. | [1]Beds above the Upper Sulphur coal | 1a. | The Halesowen sandstone group | 600 | to | 800 | |||||||
1b. | The Red, coal-measure clays | ||||||||||||
2. | [2]Upper Sulphur coal | about | 1 | ||||||||||
3. | Intermediate measures | 140 | |||||||||||
4. | [2]Little or Two-foot coal | 2 | |||||||||||
5. | Intermediate measures | from | 2 | to | 48 | ||||||||
6. | (I.) | Brooch Coal | about | 4 | |||||||||
7. | (I. 1.) | Brooch binds, ironstone measures | from | 7 | to | 20 | |||||||
8. | [2]Herring coal[3] (not known north of Dudley | about | 1 | ||||||||||
9. | (I. 2.) | Pins and Pennyearth ironstone measures[4] | from | 7 | to | 30 | |||||||
10. | Intermediate measures containing the sandstone known as the Thick coal rock | from„ | 38 | to | 157 |
- ↑ Each group of beds is numbered in consecutive order, the workable coals having an additional number in Roman figures, and the ironstones an additional number with I, before it.
- ↑ 2.0 2.1 2.2 The coals thus marked are not numbered, as they have never yet been worked.
- ↑ So called from containing many dorsal spines of fish, called herring bones by the colliers.
- ↑ These ironstones are occasionally rich in the remains of fishes.