Clam shells, particularly species of Elliptio, considerably worn from use, were found by the late W. J. Wintemberg in a number of comparatively recent archaeological sites in Ontario, such as Roebuck, Lawson, Uren, and Sidey-Mackay. He suggested that some of these had been used as knives, as scrapers, and as tools for shaping pottery vessels.
Among the specimens collected were several which showed attrition in the middle of the longer side, as shown in Figure 26. Wintemberg was apparently unable to suggest to what use these might have been put.
The following extract from Memoirs of Odd Adventures, Strange Deliverances, etc. in the Captivity of John Giles,Esq.…may afford an explanation: “To dry corn when in the milk, they gather it in large kettles and boil it on the ears, till it is pretty hard, then shell it from the cob with clam-shells, and dry it on bark in the sun.“