POKEGAMA LAKE PLATE OF THE MESABI IRON RANGE, 1899. U. S. GRAN . 



The moraine that crosses the Mississippi between Pokegama falls and the mouth 

 of Prairie river is supposed to be of composite nature and origin, having originated 

 as a median accumulation between the northern, continental, ice and the Lake 

 Superior lobe. There is some Cretaceous debris in the gravel banks, "and along the 

 river shore, and occasionally a piece of northern limestone among the boulders. 

 Glacial striae also run in a general northwest and southeast course, or more nearly 

 north and south. It is therefore probable that the margin of the Lake Superior lobe 

 had but little agency in the production of the moraine as it now exists between 

 Pokegama falls and Grand Rapids. Sufficient examination has not been made to 

 determine the nature of this morainic belt. N. H. w. 



