ScaJe, /}i%f -Dip ctjc/ Scrips °/ P/an^S. ■ Granite. ^ f^tsite ^ Pdtitc, tu^aceot. <s ^ C^ng-^O ngrar^ ^ Breccia Q Brufci 
IOWA ACADEMY OP SCIENCES, 
73 
THE SOUTHWESTERN PART OF THE BOSTON BASIN. 
