Geology shapes the park's routes, wetlands, overlooks, and long weathering history. Use the photo boxes, map links, and field references below to move through the geology section.
Rock & Mineral Pages
Start with the general overview, then jump into basalt, quartz veins, hornblende gabbro, and other formation pages.
Glacial History
Read how ice carved the basin, left till and outwash, and shaped many of the park's present routes.
Management & Restoration
Follow hazard review, slope restoration, minerals management, and long-term resource planning.
Tour & Maps
Survey Notes
| Basalt overlook | open |
| North moraine | wet footing |
| Marker 12 | route update posted |
| Quartz spur | guided only |
Helpful Geology Resources
roadside geology guide
overlook map
park geology tour
safety notice
overlook map
park geology tour
safety notice
GEOLOGY FOR VISITORS
DID YOU KNOW? The more visitors understand the park's rock and ice history, the less random the landscape starts to feel.