- Preboreal forest bed
- Early Holocene wetlands in west-central IL
Samples from the Markman peat mine in Whiteside Co., IL, were collected for us by Prof. A.E. Bettis of the University of Iowa in 2004 (his original field designation was "IL-MP"). Collected specimens had less than 50 rings and were so badly decayed that they could not be crossdated. However, there could be more and better-preserved wood at that location.