is that they are of glacial origin. This is the more certain of the "Giant Conglomerate" than of the salmon island older dolomite conglomerate. On the other hand there are some intraformational conglomerates. All in all the evidence is not yet fully in hand to explain the origin of the two main conglomerate groups. The banded nature of the sandy shales beneath the Giant Conglomerate are also evi- dence of glacial origin. Occasionally one sees a large boulder in these shales. Pieces of this shale and up to 3 feet long occur in the giant conglomerate. This conglomerate has a variable thickness, and in one place [where the large mass of marble occurs] at least a thickness of 40 feet is seen.