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AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (MINN.) 



4 The cascade at Minneopa Falls, 30 feet high, is caused by the Jordan sandstone. This R. E- 

 crosses the gorge i mile below the fall. 



5 The outlier of the St. Peter's s. s. 70 feet high, visible from the Station toward the east, gives 

 the name to the place. 



6 The Falls of St. Anthony, at Minneapolis, are caused by the rapid wearing out of the very 

 friable St. Peter's sandstone under the Trenton limestone, leaving a projecting shelf of the latter. 



