Biron Dam

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay


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NW 1/4 Sec 34, T23 N, R 6 E

Large outcrops of Archean granitic and tonalitic gneiss downriver from the dam just north of Biron. Access is from public parking at the north end of the dam.

 
View of the dam
The main outcrop area
Left and below: Looking east from the outcrop area to the dam.

Below: looking along the contact between light granitic gneiss and darker tonalitic gneiss.

Close-up of foliated granitic gneiss
Close-up of foliated tonalite
Contact between granitic and tonalitic gneiss
Contact between granitic and tonalitic gneiss
Two ages of dikes in tonalite gneiss.
 
 
Banded tonalitic gneiss
Mafic dike cutting through granitic gneiss.
Differential weathering of granitic gneiss and tonalitic gneiss (darker and more weathered).
Differential weathering of granitic gneiss and tonalitic gneiss (darker and more weathered).
Chemical weathering along joint plane in tonalitic gneiss


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Created 3 May 2005, Last Update 20 Mar 2015

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