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Utah, South Dakota, Minnesota, Iowa, Wisconsin, and Michigan. They are known, but their areas not defined, in various other localities.

The summaries of the several chapters, or their sections, the final chapter, and the maps, should serve as a text-book on pre-Cambrian geology for all advanced students in our universities. Not only will the best information available be thus put into their hands, but the whole treatment of the subject is such as give an intelligent insight into the methods of geology, and into the methods of science as well.

Rollin D. Salisbury.

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