| Symbol | Description |
|---|
| Ha | Modern floodplain. About 4 meters above late-summer river level. |
| Hw | Holocene wetlands. Dark gray or black organic muck. |
| Qe | Sand dunes. Very fine to medium sand, moderately to well sorted, commonly in dune forms. |
| Qf | Medium sand up to pebble gravel deposited in a fan shape downflow from an esker head (Qger). |
| Qger | Esker head. In downflow direction, esker rises gradually and then drops off sharply or merges with a delta. |
| Qp | Presumpscot Formation. Well sorted glaciomarine silt, clayey silt, or clay. |
| Qpns | Nearshore Presumpscot. Well sorted fine to very fine sand. |
| Qspx | Braidplain. Medium sand or larger material, up to pebble gravel size. Formed as the glacier retreated and sea level fell. |
| Qt | Glacial till. Extremely poorly sorted silty fine to medium sand, with pebbles, cobbles, and boulders inclusions. |
| Qw | Water-washed till. |
| af | Artificial fill emplaced by humans. |
| brk | Bedrock. |
Figure 5. Geomorphic divisions of the Penobscot River (from Hooke and others, 2006)
Last updated on December 12, 2006
