The Three Monoliths of the Upper Cathedral Valley Size:26X16 The Sego Canyon petroglyph panel

The Sego Canyon petroglyph panel collection is located near Thompson Springs

Above the Curtis is the thinly-bedded

its five towns are built on steep hills and atop high cliffs overlooking the Mediterranean

commonly called Rocky Mountain columbine

Washington

The Three Monoliths of the Upper Cathedral Valley Size:26X16 The Sego Canyon petroglyph panelThe monoliths (large, freestanding rock formations) are composed of the earthy, buff pink Entrada Sandstone. Deposited 160 million years ago in the Jurassic period, this fine grained sandstone formed by the deposition of sand and silt in tidal flats. It crumbles easily to a fine sand which is rapidly removed by water; therefore, talus (debris) slopes do not form and Entrada cliffs tend to rise sheer from their base. Above the Entrada, the grayish