Section of the Strata at Hartley Colliery.
| Fs. | Y. | F. | In. | Fs. | Y. | F. | In. | ||
| Clay, Sand, &c. to the the Coal | 5 | ─ | ─ | ─ | Brought forward | 57 | 1 | ─ | 7 |
| Post | 16 | ─ | 1 | ─ | Grey Thil | ─ | ─ | ─ | 3 |
| White post | 2 | 1 | 2 | 2 | White and Grey post | ─ | 1 | ─ | 3 |
| Benton Seam | ─ | 1 | 2 | 2 | Blue Metal | ─ | ─ | 1 | 6 |
| Clay | ─ | ─ | ─ | 3 | Black ditto mixed with Coal | ─ | 1 | ─ | 9 |
| Ground Coal | ─ | ─ | 1 | 4 | Grey post | 2 | ─ | 1 | 4 |
| Thil of ditto | ─ | ─ | 1 | ─ | Grey Metal Stone | 1 | ─ | ─ | ─ |
| Blue Metal | ─ | 1 | 1 | 2 | Grey Metal | 2 | ─ | 1 | 4 |
| Black ditto | ─ | 1 | 2 | 1 | Black ditto | ─ | ─ | 1 | 4 |
| Blue ditto | 3 | 1 | ─ | 3 | Coal with Metal bands | ─ | ─ | 2 | 4 |
| Black ditto | 3 | 1 | ─ | 11 | Thil and Grey Metal | ─ | ─ | 2 | ─ |
| Grey ditto with girdles | 3 | 1 | ─ | 11 | Grey Metal Stone | 1 | 1 | 1 | 1 |
| Blue ditto | ─ | 1 | ─ | 11 | Black Metal and Coal pipes | ─ | ─ | 2 | 6 |
| Metal Coal | ─ | ─ | 1 | 10 | Coal mixed with Metal | ─ | ─ | ─ | ─ |
| Thil | ─ | ─ | ─ | 5 | Grey Thil | ─ | ─ | ─ | 6 |
| Grey Metal with post girdles | 1 | 1 | 1 | 1 | Grey Metal Stone | ─ | ─ | 2 | ─ |
| White post | ─ | 1 | 1 | ─ | Blue ditto | ─ | 1 | 1 | ─ |
| Whin | ─ | ─ | 1 | 7 | Grey Metal Stone | 1 | 1 | 1 | 6 |
| White post | ─ | 1 | ─ | 3 | Gey Semy post | ─ | 1 | ─ | ─ |
| Blue Metal | ─ | ─ | 2 | 6 | Grey Metal Stone | ─ | 1 | ─ | ─ |
| White post | 2 | 1 | ─ | 6 | Ditto with girdles | 1 | ─ | ─ | 10 |
| Grey Metal with girdles | 1 | 1 | 1 | 1 | Black Metal | ─ | ─ | 1 | ─ |
| White post | ─ | 1 | 1 | 6 | Coal | ─ | ─ | 2 | 3 |
| Grey Metal | ─ | ─ | 2 | 4 | Grey Metal | ─ | ─ | 1 | 1 |
| Blue ditto | 2 | 1 | 1 | 9 | Coal with Metal band | ─ | ─ | 1 | 10 |
| Mixed Coal and Stone | ─ | ─ | 2 | 6 | Grey Thil | ─ | ─ | ─ | 4 |
| Black Stone | ─ | ─ | 1 | 6 | White and Grey post | 1 | 1 | ─ | ─ |
| White post | ─ | ─ | 2 | 2 | Grey Metal Stone | ─ | ─ | 1 | 8 |
| Grey Metal | ─ | ─ | 1 | 2 | Blue ditto | 3 | ─ | ─ | ─ |
| Post girdles | ─ | ─ | ─ | 3 | Black ditto | ─ | ─ | 1 | 11 |
| Grey Metal | ─ | ─ | ─ | 4 | Coal | ─ | ─ | ─ | 1 |
| Post girdles | ─ | ─ | ─ | 10 | Grey thil | ─ | ─ | ─ | 4 |
| Grey Metal | ─ | ─ | 2 | 4 | Blue Metal | ─ | 1 | ─ | 8 |
| Blue ditto | ─ | ─ | ─ | 4 | Grey Seamy post | ─ | 1 | 1 | ─ |
| White post | 4 | 1 | ─ | 5 | Blue Metal | ─ | 1 | 1 | 9 |
| Blue Stone | ─ | 1 | 2 | 9 | Black Metal | ─ | ─ | 1 | 4 |
| Yard Coal | ─ | 1 | ─ | 7 | Main Coal | ─ | 1 | 1 | 5 |
| ────────── | ────────── | ||||||||
| Carried forward | 57 | 1 | ─ | 7 | 83 | 0 | 2 | 3 | |
| ────────── | ────────── | ||||||||
