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Panoramic photo of southern Sawatch Range

Detailed Description

Panorama, looking west to north, of southern Sawatch Range (peaks on horizon) mountain block where it merges with the western end of "Poncha" mountain block (lower ridges in middle/foreground). South end of Upper Arkansas River Valley visible at the right edge of photo. Trace of older (Miocene?) range-front fault separating the two blocks is located where dissected bench in left middle/foreground, capped by bouldery gravel of Mio-Pliocene Dry Union Formation, intersects base of wooded escarpment (in left middle distance) formed in Paleozoic-Proterozoic basement rocks.