Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay
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Irma Hill is an outlier of Cambrian sandstone off Highway 51 about halfway between Merrill and Tomahawk.
Irma Hill is the most isolated Cambrian outlier, located exactly on the crest of the Wisconsin Arch and about 60 kilometers (40 miles) from the nearest Paleozoic outcrop.
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Above: views looking west. Left: parking is available at the turnoff for the transmission towers Below: views looking east |
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Left: the sandstone is a highly silicified buff fine-grained material. Its
Cambrian age is based on worm borings. Below: general views of the outcrops. |
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 | Left: ripple marks |
 | Left: looking west down the hill. |
 | Left: granite erratic |
 | Left: large erratic of staurolite schist |
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Created 10 April 2007, last update 10 April 2007
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