hoodoos and a mountie

This is the only Royal Canadian Mounted Police person I encountered, a bit one dimensional. So on the way back home I checked out the intriguing looking and sounding Hoodoos
View up towards the Hoodoos (in the middle of the photo looking like pale towers on green sloping hillside) from the bridge over the Trans Canada Highway. Up close a hoodoo is like an impossible pillar of gravel. Why doesn't it melt? The information board beside the hoodoos says they are formed from glacial till deposited at the end of the last ice age. The hill and the hoodoos are eroding at different rates - a cap of resistant material, rock or just a hard layer protect the hoodoos from erosion.
Further up the hill and looking back towards Canmore, hoodoos bottom right