Erratics from the pebble gravels in the Thames basin were collected at several localities between Bishop's Stortford and Clacton-on-Sea, eastern England, and examined. A table showing the type and source of the erratics is given. It is concluded that the gravels belong to the proto-Thames drift and are not of marine origin. The gravel of the Clacton channel is thought to be a rearrangement of the proto-Thames drifts with later additions.

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