Publisher's Synopsis
Excerpt from The Geological and Natural History Survey of Minnesota: The Tenth Annual Report, for the Year 1881
Below the above-mentioned bed of dark-brown or red shale, the rock is altogether less firm and siliceous than it is above, or to the east After a thickness of about twelve feet of rock, somewhat like the rock overlying, another bed of shale, or shaly rock, is met with, whose extent cannot be defined, as it seems to alternate with thin bands of.
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