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- W1967114006 abstract "The Baraboo Quartzite and overlying metasediments in south-central Wisconsin long were assumed correlative with middle Precambrian Huronian and/or Animikean strata of the Lake Superior region-that is, presumably between 1,800 and 2,600 m.y. old. Like Animikie rocks in northern Wisconsin and Michigan, the pure quartzite at Baraboo is overlain by dolomite, banded iron formation, and slate. But rhyolitic tuff breccias and welded tuffs that stratigraphically underlie the Baraboo metasediments have yielded a Rb-Sr whole-rock isochron date of $$1,640 pm 40 m.y. (lambdabeta = 1.39 times 10^{11} years^{-1})$$ with an initial $$Sr^{87}/Sr^{86}$$ ratio of $$0.7048 pm 0.0064$$. Previous isotopic dating indicates that similar quartzite at nearby Waterloo, Wisconsin can be no younger than 1,410-1,440 m.y.; this appears to be a younger limit for all of the Baraboo-type sediments. If the Rb-Sr isochron age is interpreted as approximately the time of eruption of the rhyolites, then overlying Baraboo metasediments ..." @default.
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- W1967114006 date "1972-09-01" @default.
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- W1967114006 title "Age and Correlation of the Precambrian Baraboo Quartzite of Wisconsin" @default.
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