Age Determinations, Wisconsin Range

Beacon Supergroup have been preserved along the Olentangy Glacier in Fig. 7.4 and at the eastern end of the Wisconsin Plateau near Mt. Brecher (2,098 m) and Mt. LeSchack (2,265 tn). 

With the probable exception of the hornblende migma-tite on Spear Nunatak (Section 7.2.3), the phylUtes and metagraywackes of the LaGorce Formation are the oldest rocks in the basement of the Wisconsin Range. 

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