Abstract
A continuously cored borehole at Hartwell, near Aylesbury, Buckinghamshire, proved the Purbeck (5.16 m), Portland (12.79 m), Kimmeridge Clay (47.95 m) and Ampthill Clay (10.79 m seen) formations of Late Jurassic age. Enhanced by field and other borehole data gathered during recent 1:10000 scale mapping of the surrounding area, the borehole provides a permanent reference section for these formations in the Aylesbury-Oxford region.
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