Features – Devils Backbone

Devil’s Backbone – Prominent Geological Features of Crater Lake National Park

#7 on the map – west side of Crater Lake caldera

View northwest showing the two segments of the Devil’s Backbone dike that cut all four visible lava units, Crater Lake National Park, Scientific Investigations Map 2832, Sheet 4 of 4, Geologic Map of Mount Mazama and Crater Lake Caldera, Oregon (2008), by Charles R. Bacon

The Devils Backbone is a vertical wall of dark andesite lining the cliff face and measuring about 1,000 feet long by 50 feet across near the top. A dike formed by molten lava that created and filled cracks, as it forced its way up through the rock and then solidified. It has been left standing by the erosion of the surrounding material.Of all the dikes on the walls of Crater Lake, only one, the Devil’s Backbone, reaches from the water’s edge to the rim. If this once served as the feeder to a surface flow, the lava has been removed by erosion. Close to the lake the dike is 23 feet wide, but upward it increases in width to approximately 50 feet. Slightly more than halfway up the caldera wall, the dike is offset (plate 29). Like the dacite intrusions just mentioned, the Devil’s Backbone has thin glassy selvages enclosing a paler, holocrystalline, and somewhat vesicular core rich in cristobalite. [The Main Andesite Cone of Mount Mazama: Andesite Dikes,The Geology of Crater Lake National Park, Oregon (1942) by Howell Williams]

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Crater Lake National Park

Prominent Geological Features Map

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  1. Features – Applegate Peak
  2. Features – Bald Crater
  3. Features – Cloudcap
  4. Features – Crater Lake Caldera
  5. Features – Crater Peak
  6. Features – Desert Cone
  7. Features – Devils Backbone
  8. Features – Dutton Cliff
  9. Features – Eagle Crags
  10. Features – Garfield Peak
  11. Features – Godfrey Glen and Colonnades
  12. Features – Grouse Hill
  13. Features – Hillman Peak
  14. Features – Kerr Notch
  15. Features – Llao Rock
  16. Features – Llaos Hallway
  17. Features – Maklaks Crater (Diller Cone)
  18. Features – Mazama Rock
  19. Features – Mount Scott
  20. Features – Palisades
  21. Features – Phantom Ship
  22. Features – The Pinnacles
  23. Features – Pumice Castle
  24. Features – Pumice Desert
  25. Features – Pumice Point
  26. Features – Red Cone
  27. Features – Redcloud Cliff
  28. Features – Rugged Crest
  29. Features – Scoria Cone
  30. Features – Scott Bluff
  31. Features – Sentinel Rock
  32. Features – Skell Head
  33. Features – Sun Notch
  34. Features – Timber Crater
  35. Features – Union Peak
  36. Features – The Watchman
  37. Features – Williams Crater (Forgotten Crater)
  38. Features – Wineglass
  39. Features – Wizard Island

Note: the numbers associated with each feature name above correspond to their place on the Custom Google Map