Roche Mountonnee is a glacial rock formation. It is the result of abrasion on the upstream slope and intense quarrying at the position of the steep downstream slope (Ritter 2002). When the glacier advances on a resistant rock outcrop, it must rise up and over the rock. While the glacier is doing this, the pressure increases on the upstream slope. This causes heat and melts some of the ice. The water advances to the downstream slope where the pressure is released, causing the water to freeze to ice again. The water freezes in the cracks in the rock causing frost wedging. Over many cycles of this process the pieces of rock are “popped” into the glacier and taken away. The upstream, gentle slope will be polished smooth from abrasion.