Water erosion at Johnston Canyon

On 11 September 2013, I was thrilled to bits to visit Johnston Canyon, in Banff National Park, with a couple of friends. I don't remember ever going there before, but if I did, it would have been 30+ years ago. A very enjoyable walk up to the Lower Falls - we decided not to go to the Upper Falls as well. The rocks and cliff walls down at water level were so beautifully eroded, smooth from the power of water.