HOME	Photographs Click on a thumbnail for a larger view and a description of the photograph. 1. Wall Mountain Tuff (Twm, 36.9 Ma) 2. Bonanza Tuff (Tbd, 33.2 Ma) 3. Volcanic and intrusive rocks of the Conejos Formation 4. Basalt of point Benny (30.22±0.10 Ma) 5. Saguache Creek Tuff (Tsc, 32.2 Ma) 6. East wall of North Pass caldera 7. Chaotic breccias along west margin of North Pass caldera 8. Fill of North Pass caldera 9. Andesite of Lone Tree Gulch (Tla) 10. Outflow ignimbrite sheet of Fish Canyon Tuff 11. Carpenter Ridge Tuff (Tcr) 12. Wason Park Tuff (Tw) and Sheep Creek fault zone 13. Huerto Andesite (Thu) 14. Panoramic view of the western side of Cochetopa Park 15. Outflow ignimbrites erupted from the San Luis caldera complex 16. Nelson Mountain Tuff (26.90 Ma) 17. Oblique view (Google Earth), looking north at Cochetopa and North Pass calderas 18. Panorama of Cochetopa Park caldera 19. Cochetopa Dome Rhyolite 20. North topographic rim of Cochetopa Park caldera 21. Caldera-collapse landslide breccia, clasts of Fish Canyon Tuff 22. Coarse caldera-margin fanglomerate (Tpff) 23. North caldera margin 24. Cochetopa Park caldera and Cochetopa Dome 25. Prosser Rock 26. High snow-covered peaks of San Luis caldera complex 27. Northwest topographic rim of Cochetopa Park caldera 28. Precambrian granitic rocks (pCg) Click on a thumbnail for a larger view and a description of the photograph.
INTRODUCTION
DATA
PLOTFILES
PHOTOGRAPHS
LINKS

U.S. Department of the Interior
KEN SALAZAR, Secretary

U.S. Geological Survey
Marcia K. McNutt, Director