The area covered by this report has been surveyed (1923–1931) by parties of the Geological Survey of Canada, for the most part under the leadership of the author. The work was undertaken because of the urgent need for a standard section across the Appalachians of southern Quebec, often called the Notre Dame Hills (see Fig. 1). For ninety years the Survey has maintained parties in this region, but in the early days, because of inherent difficulties and because of a failure to appreciate the fact that stratigraphic standards west of the frontal fault of the Appalachians could not be safely applied to the folded rocks to the east, the region came to be considered of such structural and stratigraphic complexity that little serious detailed regional work was attempted. Local areas, around Quebec City and Lévis, Thetford, Philipsburg, and other cities, were more or less intensively studied, but with generally . . .