Geological And Natural History Survey of Minnesota
The book The Geology of Minnesota volume 1 was written by author Geological And Natural History Survey of Minnesota Here you can read free online of The Geology of Minnesota volume 1 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Geology of Minnesota volume 1 a good or bad book?
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Rolling glacial drift thus traced from Iowa into Minnesota was probably accumulated as a terminal moraine at the end of the ice-lobe which extended southeastward from the Leaf hills and the Head of the Coteau des Prairies, as more fully explained on page 406; but at a late part of the epoch, after two distinct recessions of the ice had taken place in south- western Minnesota. When this lobe of the ice-sheet attained its greatest area it terminated on the south in the vicinity of Des Moines, and... was bounded on its sides by the outermost belt of hilly and knolly drift deposits. On its east side only two morainic belts are found, but on its west side three are clearly distinguished in the west edge of this state and the east edge of Dakota. * At the time of accumulation of the second belt of morainic drift, the end of this ice-lobe had receded to Mineral ridge in the north part of Boone county, Iowa; and when the third belt was formed, its extremity appears to have been in Hancock county, Iowa.
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