COLORADO NATIONAL MONUMENT, a tract of 13,883 ac. in central Colorado, U.S.A., near the west boundary, set apart by the Government as a reservation in 1911. It is notable for its enormous sandstone monoliths which have been grotesquely formed by erosion. One of the largest of these is Independence rock; its base is 25o ft. by 1 oo ft. and it rises to a height of soo feet. Another, Fisherman's Head, is over 400 ft. high and is topped by the semblance of a human face.