Marseilles Anticline (Discarded)
Location
La Salle and northwestern Grundy Counties
References
Willman and Payne 1942
Description
Willman and Payne (1942) used subsurface mapping of the Galesville Sandstone (Cambrian) to define the Marseilles Anticline. On their map the fold trends east-northeast and has maximum relief of about 100 feet (30 m). Finding no anticline on their map of the St. Peter Sandstone (Ordovician), Willman and Payne postulated that the Marseilles is a pre-St. Peter structure.
The subsurface structure map of the top of the Franconia Formation (Cambrian, slightly younger than the Galesville) (Kolata et al. 1983; fig. 17) shows a southeast homoclinal dip where Willman and Payne mapped the Marseilles Anticline. Considering that the data obtained by Kolata et al. were more numerous and better in quality than those available to Willman and Payne (1942), it is reasonable to assume that the Marseilles Anticline does not exist at any stratigraphic level and use of the name should be discontinued.
Figure(s)
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