Excerpt from The Gneisses, Gabbro-Schists, and Associated Rocks of Southwestern MinnesotaUnless there be assumed a considerable elevation of the central por tion of the continent, it must be supposed that during Glacial or pre Glacial time the descent of the River Warren was a gentle one. Such is that of its successor, the Minnesota River, of post-glacial time. This fact, and the presence, throughout the upper portion of its course.About the P...
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