1. Ash-flow sheets of Treasure Moutain Group (erupted 29.5-28.2 Ma; from Platoro caldera in southeastern San Juan region) form banded midslope outcrops on landslide break-away scarp, east slope of Saddle Mountain. Underlying laharic conglomerates (from intermediate-composition lava flows of Conejos Formation) crop out in foreground and on lower slopes of Saddle Mountain. Dark capping units on Saddle Mountain are Pagosa Peak Dacite and Fish Canyon Tuff. View west from Hwy 160, south of Wolf Creek Pass (Saddle Mountain quad).
Photograph by P.W. Lipman.