1. A glacial stage of the middle Pleistocene in Britain.

2. A middle-Pleistocene, cold-climate series of deposits. There were a number of glacial advances in East Anglia (England), which are difficult to understand. Near Lowestoft there are two till sheets separated by stratified sands. The lower, North Sea Drift, contains Scandinavian erratics, and the upper, thicker till, contains erratics of Jurassic or Cretaceous material. The highest terraces of the Thames may belong to this period and perhaps could also be correlated with the Elsterian deposits of Europe.