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    The difficulty in the assumption of a glacial lake is to account for the containing barriers. There is no difficulty regarding its northern and north-western margin, for that would be formed by the ice sheet itself. Partial boundaries would have been provided to the south-west by the Slieve Aughty Mountains, to the south by the Silvermines Mountains, and to the south-east by the Slieve Bloom Mountains ; but these hills would leave wide gaps below the level of 350 feet, and even below 250 feet at Loughrea, Scarriff (140 feet), and the Nenagh-Curraheen gap (247 feet), while to the east of Tullamore there were wide tracts below the level of 350 feet. Unless all these outlets had been blocked by ice, there could have been no glacial lakes adequate for the formation of the eskers.
    JW Gregory, 1921
    "Tory Island", an illustration from "The Ulster Journal of Archaeology" (1853).
    Above: "Tory Island", an illustration from "The Ulster Journal of Archaeology" (1853). Click on the
    image to read "The Plantation of Ireland" (pdf). Image source: Internet Archive.
    Left: detail from satellite photo (click for larger version).
    Charon (MIT Project) 1989, James Coleman ©