Chap. IV.
OF ANCIENT BUILDINGS.
223
Measurements by Dr. H. Johnson of the thickness of the vegetable mould over the Roman ruins at Wroxeter.
Trenches dug in a field called "Old Works."
| Thickness of mould in inches. | ||
| 1. | At a depth of 36 inches undisturbed sand was reached | 20 |
| 2. | At a depth of 33 inches concrete was reached | 21 |
| 3. | At a dep„th of 3„9 inches concrete was reached | 9 |
Trenches dug in a field called "Shop Leasows;" this is the highest field within the old walls, and slopes down from a sub-central point on all sides at about an angle of 2°.
| Thickness of mould in inches. | ||
| 4. | Summit of field, trench 45 inches deep | 40 |
| 5. | Close to summit of field, trench 36 inches deep | 26 |
| 6. | Close to sum„mit of field,„ trench 28 inches deep | 28 |
| 7. | Near summit of field, trench 36 inches deep | 24 |
| 8. | Near sum„mit of field,„ trench at one end 39 inches deep; the mould here graduated into the underlying undisturbed sand, and its thickness is somewhat arbitrary. At the other end of the trench, a causeway was encountered at a depth of only 7 inches, and the mould was here only 7 inches thick | 24 |
| 9. | Trench close to the last, 28 inches in depth | 15 |
| 10. | Lower part of same field, trench 30 inches deep | 15 |
| 11. | Lower part of„ same field,„ trench 31 inches deep | 17 |
| 12. | Lower part of„ same field,„ trench 36 inches deep, at which depth undisturbed sand was reached | 28 |
