Savanna-Sabula Anticline (Discarded)

Location

Northern Ogle and Carroll Counties, Illinois; westward into Iowa

References

McGee 1890, Savage 1906, Cady 1920, Templeton and Willman 1952, Kolata and Buschbach 1976, Bunker et al. 1985

Description

Before the Plum River Fault Zone was recognized, several geologists interpreted the structure as an east-trending anticline with a steep north flank. This anticline was called by various names, but Savanna-Sabula was most widely used. Recent studies (Kolata and Buschbach 1976) have demonstrated that the feature is a fault zone flanked on the south by a series of asymmetrical domes and anticlines, of which the Forreston and Brookville Domes and Leaf River Anticline of Illinois are examples. Although Bunker et al. (1985) continued to apply the name Savanna-Sabula to the group of anticlines and domes south of the fault zone in Iowa, such usage is not necessary in Illinois because these appear to be isolated highs rather than a continuous anticline.