Historical:New Glarus Member

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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: Ottawa Limestone Megagroup >>Platteville Group >>Pecatonica Formation >>New Glarus Member
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Blackriveran Stage
Allostratigraphy: Tippecanoe Sequence


H. B. Willman and T. C. Buschbach

Name Origin

The New Glarus Member of the Pecatonica Formation (Templeton and Willman, 1963, p. 77) is named for New Glarus, Green County, Wisconsin.

Type Section

The type section of the New Glarus Member of the Pecatonica Formation located in the same section as the Dane Member (above the Dane Member) in a quarry and roadcut in Dane County, 4 miles north of New Glarus, Green County (SW NW NE 34, 5N-7E). The New Glarus is 5.7 feet thick at the type section.

Extent and Thickness

The New Glarus Member is generally about 5 feet thick in the northern outcrop area and thickens to 25 feet in extreme southern Illinois.


The New Glarus Member is dolomite in northern Illinois and limestone in southern Illinois and is relatively pure, thick bedded, and locally cherty.


TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation