• Mid Holocene lowland forest
• Nipissing transgression in the northern Lake Michigan Basin
This site is offshore in Lake Michigan near the city of Sturgeon Bay in Door County. Frank Pranschke located and collected over 15 specimens in July 1992 with a diving crew, and samples were identified as white-cedar and spruce. Radiocarbon dates this lowland coniferous stand to ca. 7330-7500 Cal Yrs BP.
• Two Creekan-age wood in the southern Wisconsin
• Within ca. 1 km of the Schaefer Mastodon site
A couple of samples of spruce from Neenah Quarry in Winnerbago Co., WI were provided by Dr. William Mode of UW-Oshkosh. Crossdated tree-ring series of this site contributed to a 510-year composite tree-ring record of the Green Bay area overlapping tree rings from five locations dated to the Older Dryas (see plot below).
The site collection includes buried wood from New Denmark, WI, which were provided to us from the UW-Green Bay Geosciences collection in May 2004. Crossdated tree-ring series of this site contributed to a 683-year composite record of spruce in NE Wisconsin associated with Two Creekan ice sheet re-advance dated between 14,000 and 13,300 cal y BP.
Samples collected in 1999 from a location about 1 km north of Moline, Allegan Co., MI, by Dr. Alan Kehew. They were taken from a pile of soil saved from an excavation about 8 m deep. The pile of sediment consisted of mainly gray silt containing many wood fragments and some intact spruce cones. Earlier radiocarbon dating gave ages of 12,540 ± 60 and 12,620 ±70 years.
Several samples of spruce from the Jorgensen Farm in Waushara Co., WI were collected with help of Dr. William Mode at UW-Oshkosh. Crossdated tree-ring series of this site contributed to a 510-year composite tree-ring record of Green Bay area overlapping tree rings from five locations dated to the Older Dryas (see plot below).
A good size collecction of samples was obtained from the UW-Green Bay Geoscience Dept. collection in May 2004. They had been discovered during the excavation for the heating tunnel on the campus.Tree-ring analysis reveals that there were spruce logs deposited in lacustrine sediments ca. 13,100 yrs cal BP.
These are samples from the collection that Hugh Ilits made in 1958 from an excavation along Nicolet Road in Green Bay, WI. The wood had been stored at the University of Wisconsin-Madison.
Crossdated tree-ring series of this site contributed to a 510-year composite tree-ring record of the Green Bay area overlapping tree rings from five locations dated to the Older Dryas (see plot below).
