Four late Wisconsinan reddish-brown tills are present along the Lake Michigan shoreline in eastern Wisconsin. These tills are distinguished by differences in grain-size distribution, clay mineral content, and stratigraphic position. The Ozaukee and Haven tills underlie the Two Creeks Forest Bed. The younger Valders Till, although not present at a forest bed locality, is also pre-Twocreekan age based on several arguments including correlation with tills of the adjoining Green Bay Lobe. One Greatlakean age till, the Two Rivers Till, has been recognized, and this clearly overlies the Two Creeks Forest Bed. As previously reported, we conclude that the Valders Till is most likely of pre-Twocreekan age and that “Valderan” is an inappropriate term as a substage name for post-Twocreekan time and that the use of the term “Greatlakean” is justified by stratigraphic studies.

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