(Shift goes in, control goes out, click-drag to move around)
Initial view to the southeast up the Roaring Fork River as Greg talks about salt collapse features in the area for GEOL4717. View to far right (downstream) clearly shows the westward tilt of the terrace (gravels of which are at Greg's feet). Motion of salt upward into the Roaring Fork is interpreted to have produced an anticline along the river, which tilted the terrace away from the river. The anticline has been breached by continued erosion. Far upstream a white/red contact in a hillside is probably the roof of a diapir (the white material) forcing its way up. The bluffs at far left are capped by Miocene volcanic flows that are about 3000' below identical flows outside the collapse area, indicating overall loss of material by dissolution of salts in the subsurface. March 31, 2007.