A002 THE USE OF MICROGRAVITY FOR THE DETECTION AND CHARACTERIZATION OF SINKHOLES AND HISTORIC EXTRACTION FEATURES IN THE CHALK 1 P. STYLES S. TOON E. THOMAS and M. SKITTRALL 1 Applied and Environmental Geophysics Research Group Keele University Keele Staffs. ST5 5BG UK 2 Geotechnology 3 Mouchel Parkman GB Ltd Chalk has been extracted extensively in the United Kingdom for more than 4 000 years with excavations for flints at Grimes Graves near Thetford in Norfolk probably being the earliest instance. From as early as Roman and Saxon times the flint contained within the chalk was initially quarried and mined


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