HARMER : THE PLEISTOCENE DEPOSITS OF EAST ANGLIA. 317 
Fig. 3. 
MAP SFIOWING THE PRINCIPAL EXPOSURES OF 
THE CHILLESrORD CLAY ( + ) AND THE PROBABLE 
COURSE OF ONE OF THE ESTUARIES OF THE RHINE 
AT THE CHILLESFORD STAGE. (THE DOTTED AREA 
INDICATES APPROXIMATELY THE DISTRIBUTION OF 
THE PEBBLY GRAVELS.) 
a shell — up to that time unknown in the Crag basin — Tellina 
balthica. Between ColtishaU and Wroxham the sea of the Tellina 
halthica Crag seems to have denuded the Chillesford Clay, so that 
