Stratigraphy and correlation of the Chalk Group seen in the Berkshire Downs LOCAR boreholes

Six cored boreholes drilled in the Chalk Group of the Berkshire Downs as part of the LOCAR (Lowland Catchment Research ) Project show a stratigraphical range fiom the upper New Pit Chalk Formation to the upper Seaford Chalk Formation. A combination of lithological, geophysical and macrofossil criteria can be used to correlate the successions. These correlations show that the top of the Lewes Nodular Chalk is diachronous, but below the correlative horizon of Shoreham Marl 2, which marks the top of the Lewes Nodular Chalk in Sussex. There is some evidence to suggest that the chalk found in the Boxford Borehole may have been affected by shearing.