A drumlin, from the Irish word droimnín ("little ridge"), first recorded in 1833, in the classical sense is an elongated hill in the shape of an inverted spoon or half-buried egg[1][2] formed by glacial ice acting on underlying unconsolidated till or ground moraine. Assemblages of drumlins are referred to as fields or swarms;[3][4] they can create a landscape which is often described as having a 'basket of eggs topography'.[5]
^Menzies(1979) quoted in Benn, D.I. & Evans, D.J.A. 2003 Glaciers & Glaciation, Arnold, London (p431) ISBN0-340-58431-9
^Bryce, James (1838). "On the evidences of diluvial action in the north of Ireland". Journal of the Geological Society of Dublin. 1: 34–44. hdl:2027/mdp.39015035541435. Originally presented in 1833 by Irish geologist James Bryce (1806–1877). From p. 37: "This peculiar form is so striking that the peasantry have appropriated an expressive name to such ridges; while Knock, Sleive, Ben, have each their peculiar significations, the names Drum and Drumlin (Dorsum) have been applied to such hills as we have been describing."
^Benn, Douglas I.; Evans, David J.A. (2003). Glaciers and Glaciation (First ed.). London: Arnold. p. 434. ISBN0340584319.