Is the course of Green River across the Uinta Mountains that of an antecedent or a superposed stream? If superposed, on what formation was its course established? These questions have been the subject of lively discussion for half a century, without being conclusively answered. Much interest has been manifested also in two formations of this region, the Bishop conglomerate and the Browns Park formation, the age, origin, and interrelations of which have not been completely understood.

During field-work for the United States Geological Survey in 1921 and 1922 the writer had an opportunity to study the Browns Park formation throughout its entire known area of outcrop, and has become convinced that this formation supplies the key to the relations of Green River and the Uinta Mountains.

Before presenting the problems and the proposed solutions, the writer wishes to express his deep obligation to his associates, W. H. Bradley, James . . .

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