Illustration showing hoodoo cut by fault

Hoodoo in the intrarift "Poncha mountain block" (near Salida) composed of tilted sand and gravel of the Mio-Pliocene Dry Union Formation that are cut by a normal fault (white line, arrows showing slip sense). Structural measurements on faults such as this are being collected systematically to constrain the deformational and uplift histories of mountain blocks within and flanking the northern Rio Grande rift.