| Date or Age | Event | Deposits |
|---|---|---|
| A.D. 1859, 1865, 1907? | Minor explosive eruptions of Mount Hood | Scattered pumice |
| late 19th century | Late neoglacial advance | Prominent, sharp-crested moraines |
| late 18th century | Old Maid eruptive period | Lava dome, pyroclastic-flow and lahar deposits, tephra |
| about 500 years ago | Debris flows in Zigzag River | Debris-flow deposits |
| 1,000 years ago | Debris flows in upper Sandy River | Debris-flow deposits |
| 1,500 years ago | Timberline eruptive period | Lava dome, pyroclastic-flow and lahar deposits, tephra |
| 7,700 years ago | Eruptions from vent near Parkdale; Mount Mazama ashfall | Basaltic andesite of Parkdale lava flow; about 5 centimeters of Mazama ash |
| 11-20,000 years ago | Waning phases of Evans Creek glaciation | Moraines |
| 13-20,000 years ago | Polallie eruptive period | Lava domes, pyroclastic-flow and lahar deposits, tephra |
| 20-25,000 years ago | Maximum of Evans Creek glaciation | Belts of moraines in most valleys |
| 20-30,000 years ago | Mount Hood dome eruptions | Lava domes, pyroclastic-flow and lahar deposits |
| 30(?)-50,000(?) years ago | Mount Hood lava-flow eruptions | Andesite lava flows of Cathedral Ridge and Tamanawas Falls |
Return to:
[Report Menu] ...
[Mount Hood Eruptive History Menu] ...
[Mount Hood Menu] ...
