| 1-2-1 Fine to medium grained smooth sediment |
| 1-2-2 Mixed smooth sediment and rock |
| 1-2-3 Rock and boulders, rugose |
| 1-2-4 Rugged anthropogenic material |
| 1-2-5 Smooth anthropogenic material |
| 1-2-6 Medium to coarse grained, rippled sediment |
| 1-3-1 Fine to medium grained smooth sediment |
| 1-3-2 Mixed smooth sediment and rock |
| 1-3-3 Rock and boulders, rugose |
| 1-3-4 Rugged anthropogenic material |
| 1-3-5 Smooth anthropogenic material |