My image capture software cannot do justice to the quality of the British Geological Survey map. It is quite expensive though at £8.50 in 1995.
This map is from an interesting booklet by the Geologists' Association, Guide number 25 by Daley & Insole (ISBN 0 7073 0446 6) purchased from the geology museum in Sandown - well worth a visit! See the books page
A similar map is available in the 'Teachers Guide' from the Isle of Wight Teachers' Centre Publishing Unit.