The Pinnacles - Prominent Geological Features of Crater Lake National Park

 

These towering needle-like formations of rock, called fossil fumaroles, projecting from the Sand Creek Canyon floor, were formed under sheets of volcanic pumice that preceded Mazama's collapse. As the surface of the hot pumice cooled over the years, steam and gases were released by the hot rocks underneath through vents and tubes that were welded into cement hardness by their passage. These ancient vents now stand alone due to the erosion of the surrounding softer materials.

Plate 16. The Pinnacles, Sand Creek canyon, showing pale pumice flow beneath smoke-gray scoria flow, above which lie 10 feet of fine ash. (Photograph by George Grant, National Park Service.) The Geology of Crater Lake National Park, Oregon (1942) by Howell Williams

1. Applegate Peak 2. Bald Crater 3. Cloudcap 4. Crater Lake Caldera 5. Crater Peak 6. Desert Cone 7. Devil's Backbone 8. Dutton Cliff 9. Eagle Crags 10. Garfield Peak 11. Godfrey Glen 12. Grouse Hill 13. Hillman Peak 14. Kerr Notch 15. Llao Rock 16. Llao's Hallway 17. Maklaks Crater 18. Mazama Rock 19. Mount Scott 20. Palisades 21. Phantom Ship 22. Pinnacles 23. Pumice Castle 24. Pumice Desert 25. Pumice Point 26.  Red Cone 27. Redcloud Cliff 28. Rugged Crest Scoria Cone Scott Bluff Sentinel Rock 29. Skell Head 30. Sun Notch 31. Timber Crater 32. Union Peak 33. Watchman 34. Williams Crater 35. Wineglass 36. Wizard Island Note: the numbers associated with each feature name above correspond to their place on the Custom Google Map below

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