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Fig. 3.22 P680267 Cannon-shot gravel, Lincolnshire; such deposits also occur in other parts of
eastern England, including many sites in Norfolk. The term, 'Cannon-shot' was adopted by
Harmer and Wood, Jun. since these gravels occasionally contain symmetrically rounded flints
resembling in size and shape cannon-balls that were formerly used in military gun-fire. Harmer
suggested that these distinctive flints may probably have been formed during the glacial period in
kettle-holes beneath ice sheets. Unlike glacial boulder-clays and sands he noted that they do not
form continuous sheets but instead occur in isolated masses, sometimes of considerable thickness
and extent, often occupying elevated sites such as at Poringland and Mousehold Heath in Norfolk.
(CP13/050 Reproduced by permission of the British Geological Survey NERC. All rights
reserved)
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