See letter from Joseph Prestwich, 2 January 1880 and n. 1. Thomas Francis Jamieson proposed that the ‘parallel roads’ of Glen Roy marked the shores of glacial lakes in a paper presented to the Geological Society of London (Jamieson 1863). In 1861, CD received a report of Jamieson’s initial findings and expressed support for Jamieson’s theory, referring to his own paper on the subject as ‘one long gigantic blunder’ (see Correspondence vol. 9, letter from T. F. Jamieson, 3 September 1861, and letter to T. F. Jamieson, 6 September [1861]).