|This is an eratic field. An eratic is a rock that was picked up and carried by a glacier. When the glacier melted, the rocks were gently lowered to the mountain surface below as is pictured here.|
This is an interesting eratic. It was dropped on the top of this ridge and it is very out of place.
As the glacier moves over the bed rock it polishes the rock from it's extreme weight plus the surface of the glacier is like sandpaper from all of the rock and debris it collects along the journey. This image illustrates glacier polish and an eratic that was dropped on top of the polish. Interesting.
Another polish and eratic example.
As the glacier moves, it conforms to the rock surface under it as illustrated in this photo.