a bed on the rising ground west of Russell's Hall, and intrusive bosses of it rise to the surface at a spot on the western outskirts of the town of Dudley, at the Fiery Holes, at the east side of Cooper's Bank, and in the brook to the west of it.
At one of Lord Ward's pits at Tividale (about a quarter of a mile north by west of Coxes Rough) they found, at a depth of 500 feet, the following beds:—
| FT. | ||
| 1. | Coal mingled with rock, representing Thick coal | 24 |
| 2. | White rock, sandstone | 33 |
| 3. | Strong rock | 9 |
| 4. | Binds | 6 |
| 5. | Gubbin measures | 2 |
| 6. | Coal mingled with rock (represents Heathen coal) | 4 |
| 7. | Green rock, sank into for | 27 |
The usual distance between the Thick coal and the Heathen coal is only 12 or 14 feet, instead of 54, as here; Nos. 2 and 3 being quite unusual measures.
At Dudley Port, in Mr. Bagnal's limestone pits, they passed through 15 feet of "green rock" in the lowest sandstone of the Coal-measures, just before entering the Silurian shale.
At Tipton Moat colliery and at Tipton there were 34 feet of "green rock" at a distance of 36 feet below the Bottom coal. At Deepfields they got 20 feet of 'green rock" at a depth of 39 feet below the Bottom coal. At Highfields they found the " green rock" at a depth of 66 feet below the same coal, and sank into it for 15 feet only. At Bradley, in Mr. Addenhook's colliery, they found the "green rock" 55 ft. 6in, thick at a depth below the Bottom coal of 24 ft. 6 in.
Near Bilston, in a pit in a field called Crabtree piece. Messrs. W, and J. W. Sparrow found 15 feet of "green rock" 22 feet below the Bottom coal; and at the Wallbutts colliery the " green rock" was struck 27 feet below the Bottom coal, and sank into for 10 feet.
No "green rock" has been seen cropping to the surface on the rise of the lower measures on the north-east flank of the Dudley and Sedgley ridge; nor, so far as I am aware, has any been met with east of Darlaston or Wednesbury, or about West Bromwich, either at the surface or under ground. A considerable boss of it is seen, however, in the canal bank between Moxley and the Broadwater furnaces, which must either belong to another mass or must cut up through the Thick coal and the beds above it to reach the surface. It may also have been met with in other situations in the workings of which the record is now lost.
In the district between Wolverhampton and Walsall "green rock" is frequently met with in sheets in the lower measures, varying in thickness from 15 feet to 80 and 90 feet. In the southern part of this tract it lies below the Bottom coal, but between Wolverhampton and Willenhall it cuts up through that coal) and to the north of that is always found above the Bottom coal, between it and the Fire-clay coal. A boss of it rises to the surface, cutting up through the New mine coal at the Heath colliery north-east of Wolverhampton, and a little north of that a large mass of it rises broadly out and forms the surface of the ground all around Wednesfield, as delineated in the map. In the Bentley district the basalt of Pouk Hill seams merely to be an irregular swelling of the bed of "green rock" that crops out a little further east along the bank of the canal. This bed is found in the underground workings for about half a mile to the westward of Pouk Hill,
