"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
DENDROCHRONOLOGY. Determining the age of a structure can sometimes be estimated by looking at the wooden beams. In log cabins, for example, the bark was left on the outside of the log, so a definite final ring can be seen in a cross-section.
Archaeologists have, over years, developed keys indicating the width or thinness of rings found in trees from the area. Wide rings develop during years of abundant moisture. Thin rings indicate drought. One ring develops for each year the tree grew. By matching the known key to a new sample, an estimate of when the tree was cut down can be determined.