Professor Iain Stewart joins the Edinburgh Geological Society to look at scratches in the rocks of Blackford Quarry. In 1840 Swiss geologist Louis Agassiz argued that these had been made by ice, and that the shape of Edinburgh Castle's rock and the Royal Mile had been formed by ice. Animation is used to show how ice was forced round the hard rock to form the crag and tail.

This clip is from:
The Big Freeze
First broadcast:
14 December 2010

Look at maps of Edinburgh to look for glacial features. Students could produce annotated diagrams showing how Castle Rock was formed. The sequence in Blackford Quarry would be a useful example of some of small scale evidence of glaciation which could be used to inform a field trip.