Historical:Jordan Sandstone

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Knox Dolomite Megagroup >>Jordan Sandstone
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Trempealeauan Stage
Allostratigraphy: Sauk Sequence

Author

T. C. Buschbach

Name Origin

The Jordan Sandstone is named for Jordan, Scott County, Minnesota, where it is exposed in quarries and outcrops along Sand Creek (N.H. Winchell, 1874, p. 149).

Extent and Thickness

The Jordan Sandstone is not exposed in Illinois but is a few to 75 feet thick in wells in Jo Daviess and Carroll Counties.

Description

The Jordan Sandstone (A. Winchell, 1872), is the uppermost Cambrian formation in the extreme northwestern part of Illinois. In exposures along the Mississippi River a short distance northwest of Illinois in Iowa, Minnesota, and Wisconsin, the formation is a white to yellowish gray, partly iron-stained sandstone that is medium to fine grained at its base. In some places the upper part is coarse to very coarse grained (Stauffer and Thiel, 1941). It varies from thin to thick bedded. Cross bedding is common. East and south of Jo Daviess and Carroll Counties the Jordan Sandstone grades laterally to the Eminence Formation.

Fossils

Fossils are abundant in some beds in the outcrop area of the Jordan Sandstone.

References

STAUFFER, C. R., and G. A. THIEL, 1941, Paleozoic and related rocks of southeastern Minnesota: Minnesota Geological Survey Bulletin 29, 261 p.
WINCHELL, ALEXANDER, 1872, Report of a geological survey of the vicinity of Belleplaine, Scott County, Minnesota: St. Paul, Minnesota, 16 p.
WINCHELL, N. H., 1874, Second annual report for the year 1873: Minnesota Geological and Natural History Survey, p. 73-219.

ISGS Codes

Stratigraphic Code Geo Unit Designation
8590
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