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Unmetamorphosed sedimentary rocks are found in the rock record from the Cambrian, in the early Paleozoic.The feldspathic quartz sandstone and orthoquartz sandstone of Chequamegon, Devils Island and Orienta formations make up the Bayfield Group which underlies the entire Lake Superior shoreline of the state from Chequamecon Bay to the St. Louis River in the west.
Paleontology in Wisconsin refers to paleontological research occurring within or conducted by people from the U.S. state of Wisconsin. The state has fossils from the Precambrian, much of the Paleozoic, some parts of the Mesozoic and the later part of the Cenozoic. Most of the Paleozoic rocks are marine in origin.
This list of the Paleozoic life of Wisconsin contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Wisconsin and are between 538.8 and 252.17 million years of age.
Autumn in the Driftless Area of Cross Plains, Wisconsin. The Driftless Area, also known as Bluff Country and the Paleozoic Plateau, is a topographical and cultural region in the Midwestern United States [1] that comprises southwestern Wisconsin, southeastern Minnesota, northeastern Iowa, and the extreme northwestern corner of Illinois.
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2.1 Selected Paleozoic taxa of Wisconsin. 3 Mesozoic. 4 ... This list of the prehistoric life of Wisconsin contains the various prehistoric life-forms whose ...
Like almost all limestones, the Platteville variety is a marine creation. Platteville Limestone formed between 488 and 436 million years ago, when what became southeastern Minnesota and southwestern Wisconsin lay beneath an ancient sea. This sea was heavily populated by shellfish and other invertebrates.
The greenish rock under the concrete block at top center is the base of the Brainard and is dominantly a sticky green shale with thin beds of purplish gray dolomite. Above the Fort Atkinson is the Brainard Formation. The Brainard is generally a greenish gray to gray dolomitic soft to hard shale. It contains abundant fossils near the base. It ...