Some Representative Fossils and Minerals of the Prairie du Chien Group in the Upper Mississippi Valley.

The article examines some representative fossils and minerals of the Prairie du Chien Group in the Upper Mississippi Valley. According to the author, the rugged terrain in counties that border the upper Mississippi River Valley from St. Paul, Minnesota to Prairie du Chien, Wisconsin provides many productive collecting opportunities. The author adds that bluffs, quarries, and stream valleys expose rich natural and artificial sections of Paleozoic formations.