Abstract
Wooldridge (1927) recognised two subdivisions of the Hertfordshire Pebble Gravels; a third is now described. Its deposits lie at lower levels than the other Pebble Gravels and are therefore younger, and they contain a much higher proportion of pebbles of quartz, quartzite, sandstone and Carboniferous chert. They have been traced discontinuously from the Goring Gap to Bishop's Stortford, and are thought to have been laid down by an ancestral Thames. It is believed that the ‘exotic’ materials came from the Midlands, the southern Pennines and other more remote areas, and were introduced through the Goring Gap. There is some evidence that the deposits are older than the North Sea Drift of East Anglia. It is pointed out that these results provide direct confirmation of a hypothesis of Wooldridge (1938) concerning the very early course of the Thames.
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