SECTION AT ST. PAUL 



267 



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^/^Z ONE No. 8. 



ZONE No. 7 



"^^/. 



ZONE No. 6. 



-Oolite 1. 

 -ZONE No. 5. 



--'^Z ONE No. 4 



'ZONE No. 3. 



-ZONE No. 2. 



ZONE No. 1. 



FiGURK 1. — Section at Saint Paul, Minnesota 

 Showing the position of corrosion surfaces and conglomerates 



