Evidence of glaciation from 2000-2500 million years ago is shown by this ‘tillite’ – a mixture of coarse and fine fragments in a very hard rock, Whitefish Falls, Ontario, Canada. MH |
Evidence of glaciation from 2000-2500 million years ago is shown by this ‘tillite’ – a mixture of coarse and fine fragments in a very hard rock, Whitefish Falls, Ontario, Canada. MH |