|Figure 1. View of historic Ute Pss circa 1890s|
Postcard from the S. Veatch collection.
|Figure 2. Historical photo (1914) of Sawatch Sandstone resting on even erosion surface (nonconformity) of Pikes Peak granite: Ute Pass, near Manitou Springs, El Paso County, Colorado. 1914. Plate 6 in U.S. Geological Survey. Folio 203.|
At least three resistant ridges made up of Sawatch Sandstone are exposed along Ute Pass: one sandstone dike (or “injectite” as they are sometimes called) is exposed in Crystola; and two injectites (Figure 3) are exposed in Woodland Park (Temple, et al., 2007). The injectites are easy to spot—instead of Pikes Peak Granite being present, the sandstone injectites are there—with Pikes Peak Granite on either side.
An examination of the dike rocks reveals an alignment of sand grains and granite fragments inside the injectites, which relates to the forceful injection of fluidized sand into openings into the granite caused by the pressures of faulting (Harms, 1965). Some angular fragments of Pikes Peak Granite found in the injectites result from granite being plucked off of the wall rock during movement (Figure 4).
|Figure 4. View of sandstone with highly indurated fragment of Pikes Peak Granite.|
Photo date March 2, 2012.© by Steven Veatch
There is brecciated granite and brecciated sandstone formed from intense faulting (Figure 5). The sandstone contains angular clasts. The granite breccia clasts are not as angular.