A piece of what was once living history dating back before Iowa was a state is now on display in the atrium of the Wallace State Office Building in Des Moines. State Forestor Jeff Goerndt says it’s a ...
The Science Center of Iowa donated a cross section from a 440 year-old white oak tree to the Iowa Department of Natural Resources. The cross section is about 3-feet in width, and was located along the ...
Cross section of oak hull plank from 1629 Batavia ship showing its tree-rings. This sample was extracted from a loose hull plank in 2007 before the research team came up with a much less destructive ...
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