40 BURIAL MOUNDS OF THE NORTHERN SECTIONS. 
Illinois, which were found to be constructed in the usual method of this 
district; that is, with a layer of hard, mortar-like substance, or clay 
and ashes mixed, covering the skeletons. The positions of the skele- 
tons varied, as we have seen is the case in other localities. The num- 

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Tic. 16.— Group of mounds and hut-rings, Brown County, Illinois. 



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ber of intrusive burials was unusually large here. In a number of 
cases where there were intrusive burials near the surface, no bones, or 
but the slightest fragments of the bones of the original burial, could be 
found, although there were sure indications that the mounds were built 
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