The drift of the Northern more or less degraded edges of the plateau, partakes of the character of that of the lower level plains; & has a large though variable proportion of limestone & Laurentian fragments. Thick banks of undisturbed boulder clay are also seen in several places, especially towards the foot of the slope. This is especially marked where deep bays or systems of coulÈs indent=penetrate the foot of the plateau, but towards the upper ends of these the Quartzite drift again preponderates.

It would thus appear that the upper plateau drift was derived chiefly from the Rocky Mountains, & that the lower levels of the Coteau, while perhaps obtaining an equal quantity of Mountain drift, were so circumstanced as to allow a large admixture of limestone & Laurentian from the N. & E. The conditions not permitting the free distribution of the materials derived from the latter sources over the upper plateau.

These facts thus prove that the Northern edge of the ìCoteauî or Tertiary plateau was practically not far from its present shape at the time of the distribution of the drift, & this is confirmed by the absence of Northern debris in the Southern ends of valleys, as these parts have been cut out since & by the removal of softer wetter the Quartzite shingle of the higher levels has been let down into them.

(Prove by further observation & ascertain whether difference of level alone sufficient & account for absence in upper parts of valleys)

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