A Contribution to the Geology of the Pre-Cambrian Igneous Rocks of the Fox River Valley, Wisconsin (Classic Reprint) - Tapa blanda

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Excerpt from A Contribution to the Geology of the Pre-Cambrian Igneous Rocks of the Fox River Valley, Wisconsin

The areas of igneous rocks to be described in this paper are the outcrops at Utley and Berlin, in Green Lake county, and the several outcrops of granite in Waushara county, in the district of the Fox river. They are a part of the cordon of hills and ridges of pre-cambrian rocks that lie outside the more continu ous crystalline core of central and northern Wisconsin. These outlying hills were islands in the early Paleozoic seas, and around them are deposited the later horizontal formations of sandstone and limestone. Among the pre-cambrian outliers are to be found rocks of both sedimentary and igneous origin. Those of the Fox river district are igneous, of both plutonio and volcanic nature. They include those at Utley, Berlin, and Wau shara, described in this paper, and also those of another number of this bulletin at Montello, Observatory Hill, Marquette, Mar cellon, Taylor's farm, and Moundville. Farther to the south and west, at Waterloo, Baraboo, and N ecedah, are extensive areas of quartzites. The area of the various pre-cambrian out liers and their geographic distribution and relation to the pre Cambrian farther north, are outlined on the general map of Wis consin. (pi. II.) On the accompanying map (pl. I.) is ih dicated the distribution of these isolated areas on a larger scale.

The outliers vary widely in areal extent and elevation. They indicate that the early Huronian continent had not been reduced to a base-level at the time of the deposition of the early Paleozoic formations. It is very probable that some of the outcrops, at least, rose a thousand feet above the shore line of the early Pale ozoic sea.

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