New Glarus Member

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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

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

H. B. Willman and T. C. Buschbach


Original description

The New Glarus Member of the Pecatonica Formation (Templeton and Willman, 1963, p. 77).


Named for New Glarus, Green County, Wisconsin.

Other names


Type section

Type location

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.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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.




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



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