Columbia Syncline
From ILSTRUC
Location
Monroe and St. Clair Counties H, I-3
References
J. Weller 1939, S. Weller and J. Weller 1939, Bristol and Buschbach 1973
Description
The Columbia Syncline separates the Waterloo-Dupo and Valmeyer Anticlines. The synclinal axis runs north-northwest parallel with the Waterloo-Dupo. Structural relief on the top of the Galena Group (Champlainian) is more than 450 feet (135 m). The east limb dips steeper than 45° in places; the west limb is considerably broader and gentler.
