- Drowned Forest of Preboreal age
The site was collected by divers in Spring 1990 from ca. 25 m depth in Lake Michigan east of Chicago. The expedition was directed by Frank Pranschke of Northeastern Illinois University. Stable isotope analysis of wood from this site (13C, 18O, and 2H) was used for climatic reconstruction in the Great Lakes region. Reference: Leavitt S.W., Panyushkina I.P., Lange T., Wiedenhoeft A., Cheng L., Hunter R.D., Hughes J., Pranschke F., Schneider A.F., Moran J., Stieglitz R. 2006. Climate in the Great Lakes region between 14,000 and 4,000 years ago from isotopic composition of conifer wood. Radiocarbon 48 (2): 205-217.