Llao Rock - Prominent Geological Features of Crater Lake National Park

 

This great mass of dacite (a sluggish lava) was produced from a vent on the upper slopes of Mazama and hardened after moving only a mile or two. The dacite filled in a former explosion crater. This rock rises nearly 2,000 feet above the water- -the highest vertical precipice on the rim- -and was formed by the most massive single flow apparent in the caldera wall, with a maximum thickness of 1,200 feet.

Llao Rock, Crater Lake National Park, photo by Robert Mutch

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. The 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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