Lest the title of this paper may lead the reader to suppose that it contains a detailed account of the glacial phenomena of this vast region, it should be explained at the outset that it is concerned with the general facts of glacial history and the correlation of the events with those already better known in the Rocky Mountains and the eastern States. Although the writer has reconnoitered most of the ranges in the Great Basin, he has devoted his attention largely to the study of the dry eastern slope of the Sierra Nevada, where the glacial features are best displayed free from obscuring forests. There he has visited most of the glaciated valleys but has mapped only a few of them in the detail which their interest merits. It will take many years to complete the mapping, and that work will necessarily be done largely by others.

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