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The geology of Wisconsin includes Precambrian crystalline basement rock over three billion years old. A widespread marine environment during the Paleozoic flooded the region, depositing sedimentary rocks which cover most of the center and south of the state.
Wisconsin has geologic formations and deposits that vary in age from over three billion years to several thousand years, with most rocks being millions of years old. [27] The oldest geologic formations were created over 600 million years ago during the Precambrian, with the majority being below the glacial deposits.
Where the Wisconsin River turns west to join the Mississippi, the area to the south, including the whole of Grant County as well as most of Lafayette County, are part of the Driftless Area. The rugged terrain comprising most of the Driftless Area is distinct from the rest of Wisconsin, and is known locally as the Coulee Region. The steep ridges ...
Group or Formation Period Notes Black River Group/Platteville Formation: Ordovician: Black River Group/Platteville Limestone: Ordovician: Brandon Bridge Formation: Silurian: Byron Formation
Pages in category "Geology of Wisconsin" The following 19 pages are in this category, out of 19 total. ... Glacial Lake Wisconsin This page was last ...
The Wisconsin glaciation extended from about 75,000 to 11,000 years ago, between the Sangamonian Stage and the current interglacial, the Holocene. The maximum ice extent occurred about 25,000–21,000 years ago during the last glacial maximum, also known as the Late Wisconsin in North America. The Last Glacial Period caused a much lower global ...
The Milwaukee Formation is a fossil-bearing geological formation of Middle Devonian age in Milwaukee County, Wisconsin. It stands out for the exceptional diversity of its fossil biota. Included are many kinds of marine protists, invertebrates, and fishes, as well as early trees and giant fungi. [1]
Weis Earth Science Museum (abbreviated as WESM), located at 1478 Midway Rd, on the University of Wisconsin–Oshkosh, Fox Cities Campus in Menasha, Wisconsin, USA, was opened in 2002. It focuses on Wisconsin geology and its mining history.