Taken from a bridge on the boardwalk in Presquile Provincial Park, Brighton, Ont. The bridge surface is about 1.5 metres above the ice surface. The large ball is about 10 cms thick and appears to have travelled about 3 metres. The smaller one about 3 cms thick has travelled about 10 metres. There are several smaller ones. The tracks start at the bridge and do not extend to the other side which is also an ice surface.