Igneous Rocks in the Baraboo District, Wisconsin

Abstract

A restudy, with more ample descriptions than previously published. New interpretations are that the fragmental rhyolite at Alloa is a true flow breccia and not a basal phase of the Baraboo quartzite; that the sheared rhyolite at the Lower Narrows of the Baraboo River is older than the quartzite; that the so-called granite in Merrimac Township is flow rhyolite; and that evidence is lacking to substantiate the idea that the Otter Creek granite is intrusive into the Baraboo quartzite.

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