44 
clays ; and illustrated tlie partial removal of the drift gravels 
and the underlying till over a large tract of western country 
during its elevation, and the re-distribution of portions of the 
same beds as eroded by water courses after the land had 
risen above the sea. 
Dr. Alcock had examined the fossils produced, and 
especially the southern forms, and confirmed the identification 
of species. 
1 * 
