| Sequences | Lithological description | Thickness (feet) |
| Alluvium | Light brown silty clay, occasionally sandy and micaceous | 0.5 - 13.5 |
| Peat | Dark grey to brownish grey peat with large fresh-appearing roots and stems | 2.5 - 6.5 |
| Peaty clay | Dark grey carbonaceous clay | 0.5 - 1.5 |
| Middle clastic sediments | Bluish-grey silty clay, sticky in nature | 1.5 - 3.0 |
| Peat | Brownish black to greyish black peat, consisting of undecomposed to mostly decomposed plant materials | 1.5 - 3.5 |
| Lower clastic sediments | Greenish grey silty clay, sticky in nature | 7 - >150 |