Re-examination of the lithology, structure and contact relations of the Gowganda Formation reaffirms the interpretation of the unit as a tillite. It is composed chiefly of boulder-bearing, massive conglomeratic graywacke, laminated argillite-quartzite and, in some localities, basal granite conglomerate. Current-structure orientation indicates north to south paleodrainage. The polished, striated, grooved underlying surface at the basal contact is interpreted to be the product of a northeast-to-southwestward moving glacier.

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