240 
THE AVON AND ITS GRAVELS 
3. The large subangular pebbles of Millstone Grit and 
Mountain Limestone, which have travelled long distances 
and are only little worn, are evidence of their having been 
transported rapidly from their old home to their present 
position by a large volume of water. 
4. The fauna of the alluvial deposits of the highest of 
the Low Level gravels is that which may be regarded as 
typical of the period which immediately followed the 
glacial epoch. It may therefore be assumed that the bed 
of the river at the close of the glacial epoch was about 
100 feet higher than it is at present. 
