A plea to subdivide the Chalk on future maps in a manner applicable tothe whole of Britain

The 1:50 000 maps published by the Geological Survey fail to show the biostratigraphical detail which isavailable and which could be incorporated without difficulty. This has become important because: (i) the sheet Memoir series is being discontinued: (ii) one can use the same biostratigraphical divisions, mainly zones, from Dorset to Yorkshire; (iii) it would be easier for our colleagues outside Britain to understand our Chalk geology.