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IOWA ACADEMY OP SCIENCE 
Creek on the S E 1-4 of Sec. 35, Town. 100, Range 6 west. It was 
probably used for ceremonial purposes, as was also the one near the bird 
effigy. 
All the others are large, being several hundred feet in diameter, and 
in and about them are abundant indications that they were long used 
as dwelling places by man. They were probably real forts or rather 
fortified camps, the embankments supporting a palisade. 
