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Chippewa Co., Wisconsin, USA

Chippewa County is underlain mostly by Cambrian sandstones. Complex Precambrian rocks, including gneiss, amphibolites and granites are exposed along the Chippewa River and its tributaries. These rocks show graphically the effects of the Penokean Orogeny which occurred about 1.80 billion years ago. A few Keweenawan (1.1 billion year old) intrusions cut these rocks, as are well exposed at Wissota Dam near Chippewa Falls. Flambeau Ridge, on the northern edge of the County, is a folded outlier of Proterozoic quartzite and meta-conglomerate. The northern part of the County is covered by young Wisconsinan drift of the Chippewa Moraine. A major segment of Wisconsin's Ice Age Trial passes through the County, and includes an excellent visitor center devoted to Wisconsin's glacial heritage. The southern part of the county was not glaciated as recently, hence Cambrian bedrock crops out more frequently. Glacial drift in the County can provide some interesting samples to the diligent collector, including "float" copper, banded iron formation and "Lake Superior" agates.

Mineral List

Mineral list contains entries from the region specified including sub-localities
'Albite-Anorthite Series'
Almandine
'Biotite'
'Chlorite Group'
Epidote
Hematite
'Hornblende'
'K Feldspar'
Magnetite
Quartz
var: Lake Superior Agate
Zircon


12 entries listed. 6 valid minerals.

Localities in this Region

USA

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References

Laberge, G. L. & P. Myers (1984) Two early Proterozoic successions in central Wisconsin and their tectonic significance: Geological Society of America Bulletin: 95: 246-253.

Dott, R. H. & J. W. Attig (2004) Roadside Geology of Wisconsin: Mountain Press Publishing Company, 346 p.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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