Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/494

 4. The pits at Loam Pit hill, described at page 285 of this paper: a section of these pits is represented in this Plate, No. 2.

5. Pits of sand and chalk on Blackheath hill.

6. The cavern beneath the point at Blackheath. This is an extensive adit driven into the substratum of chalk.

7. Sand pits in the middle of Blackheath; these are situated in the upper sands of the plastic clay formation. In the year 1803, an extensive excavation which had formerly been made into these strata was laid open; it was supposed to extend to the chalk beneath, but the roof fell in and the passage became choaked up before it had been explored.

8. On the south-east of Montpelier Row, Blackheath, a pit was opened in the plastic clay, by Mr. St. Leger, in 1805, and manufactured into various articles of pottery. The shelly beds occurred in this pit.

9. Slope of the hill on the north of Vanburgh fields, east of Greenwich. Here the shelly beds of the plastic clay are visible.

10. A chalk pit at the foot of Charlton hill.

11. Extensive sand pits near Charlton Church. This is the inferior sand of the plastic clay; the shelly beds are seen covering it. The section precisely agrees with that of the great Woolwich pits.

12. A chalk pit at the foot of the hill.

13. The great sand pits of Woolwich. The section they present is described page 284, and represented in this plate, No. 3. About a hundred yards on the east, the excavation is continued into the substratum of chalk.

14. Here an abrupt declivity beneath the Marine barracks at Woolwich presents a good natural section of the shelly beds of the plastic clay.

15. The gravel pit at Plumsted, mentioned in Mr. Parkinson's paper on the Vicinity of London. Geol. Trans. vol. i.

16. A deep shah sunk into the substratum of chalk; mentioned at page 290 of this paper.

17. A pit in the London clay with Septaria; near the rise of Shooter's Hill; see page 290.

18. Chalk pits in the bottom of the ravine between Plumsted and Wickham.

19. Well on Boston heath, mentioned page 291 of this paper.

20. Bridgend place

21. Near Bexley

22. A deep shaft sunk into the substratum of chalk and there communicating with horizontal adits. There are many such in the woods about Crayford and Dartford heath.

23. Green Street Green

24. Cockleshell bank

25. Betsham.

26. Near Bromley. Here the shells of the plastic clay occur.