Marshall-Sidell Syncline

Location

From central Crawford to northern Vermilion County (E, F, G-8)

References

Mylius 1927, Moulton and Young 1928, Cady 1952, Potter 1956, Clegg 1965a, b, Stevenson and Whiting 1967

Description

The Marshall-Sidell Syncline is an elongated, north-trending depression between the La Salle Anticlinorium and the east flank of the Illinois Basin. The syncline is marked by relatively steep but irregular dips on the west flank and gentle dips on the east flank. The syncline is closed off obliquely on the south and terminates against the Kankakee Arch on the north.