Abstract
RECENT observations here through excavations connected with the opening up of the district have enabled me to appreciate the importance of the letter which appeared in NATURE (December 15, 1910, p. 206) from Mr. Hazzledine Warren on the “Arctic Plants from the Valley Gravels of the River Lea.” He speaks of the evidence as leaving “no doubt that the Pleistocene age was closed by a partial return to glacial conditions, succeeding an epoch when temperate conditions prevailed.” Reserving for the moment a discussion in any detail of the evidence now to hand in the upper Valley of the Stort (an affluent of the Lea), I merely wish, with your courtesy, to say now that the physical evidence bears out Mr. Warren's contention; for we must, I think, recognise hereabouts a younger Boulder Clay as distinct from the “Chalky Boulder Clay” of the Herts and Essex plateau, along with interglacial deposits consisting largely of the outwashings of the older Boulder Clay.
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