Sir,
In the discussion on the The Origin of Glacial Drifts (Journal of Glaciology, Vol. 1, No. 8, 1950, p. 435) I suggested that the date of the readvance of Eyjabakkajökull, which caused the interesting folds in the moraine, was either 1750–60 or 1840–50. My reason was that these were the dates of two very well marked advances of the glaciers in Iceland.
Mr. J. N. Jennings has since very kindly drawn my attention to a reference by Th. Thoroddsen (Island, Grundriss der Geographie und Geologie, p. 199) giving the date of the Eyjabakkajökull advance as 1889–90, with which I am fully prepared to agree.