THE MOUNTAINS OF BANFF ARE SEDIMENTARY IN ORIGIN.THIS SMALL OUTCROP OFDIORITE,SOLIDIFIED FROM ONCE MOLTEN MATARIAL, IS THE ONLY KNOWN INGEOUS ROCK IN THE PARK, IN MOLTEN FORM IT WAS INTRUDED OR SQUEEZED ONTO THE OVERLYING ROCKS MILLIONS OF YEARS AGO.THIS IGNEOUS INTRUSION OR "DYKE" HAS BEEN EXPOSED BY EROSION FROM WEATHERING, GLACIATION AND FINALLY BY HIGHWAY CONSTRUCTION.