FrOWKE] ABORIGINAL FLINT QUARRIES 523 
imbedded. After prolonged exposure to the atmosphere the entire 
nodule may be thus altered. Nodules freshly brought out from a 
considerable depth are very slightly changed in this respect and are 
easily chipped into any desired form; although hard and tough, the 
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QUARRIES 
VILLAGE SITES BRANDENBURG 
Fic. 16.—Hornstone quarries and workshops in Harrison County, Ind. 
flint, under percussion, splits into thin flakes or spalls across the 
nodule, and these flakes are more readily worked into form than 
pieces of similar shape derived from any other geological horizon 
in the Ohio valley. 
