One of the most important results of the investigations by the United States Geological Survey in Alaska has been the discovery of thick sections of marine Triassic strata in many parts of the territory. These occurrences are of extreme interest and importance, not only because they constitute such a large and important part of the areal and stratigraphic geology of Alaska that an intimate knowledge of them is essential for a full understanding of the local geologic features, but because they show important relationships with the known sections in other regions, and because they will, when thoroughly studied, undoubtedly be found to constitute one of the most important, extensive, and complete sections of Upper Triassic rocks in North America, if not in the world. They will fill out the American stratigraphic column at points where it is very deficient in many other parts of the continent.

It has become . . .

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