Report On the Progress of the State Geological Survey of Michigan: Presented ...
Report On the Progress of the State Geological Survey of Michigan: Presented ...
Michigan. Geological Survey, Alexander Winchell
The book Report On the Progress of the State Geological Survey of Michigan: Presented ... was written by author Michigan. Geological Survey, Alexander Winchell Here you can read free online of Report On the Progress of the State Geological Survey of Michigan: Presented ... book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Report On the Progress of the State Geological Survey of Michigan: Presented ... a good or bad book?
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They repose upon the older, ice- worn surface of the solid rocks; and seem to have been deposited in standing, and probably fresh or brackish waters. The boulder deposits hold a position above these clays, and are found disseminated through beds of obliquely laminated sands and clays deposited during an epoch of comparative disturbance. In the depressions of the surface of these beds repose the numerous interior lakes of our State, and the equally numerous beds of peat and marl which remain to ...point out the sites of former lakelets which the agencies of Nature have already filled. During the earlier part of the lakelet history, the elephant and the mastodon inhabited our peninsula, as is certified by the numerous bones and teeth ex- humed from our peat beds. Contemporary with these probos- cideans and with the gigantic, extinct beaver, were the early representatives of our race in Michigan. I am in possession of a flint arrow-head found in the town of Bridgewater, Washte- naw county, in excavating a State ditch, at the depth of seven feet beneath the surface.
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