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map adapted from: Geologic Map of the Bozeman 30' x 60' Quadrangle
| Qal | Alluvium of modern channel |
| Qab | Alluvium of braids |
| Qat | Alluvium of alluvial terrace |
| QTgr | Gravel |
| Tsuf | Sediment or sedimentary rock, upper Tertiary finer |
| Tsuc | Sediment or sedimentary rock, upper Tertiary coarser |
| Tba | Basalt |
| TKl | Latite |
| Aamh | Amphibolites& hornblende gneiss |
| Aqfg | Quartzofeldspathic gneiss |
| Aq | Quartzite |