All radiocarbon samples listed here are taken on charcoal or ash and are conventional radiocarbon dates, unless otherwise stated.
The dates quoted are uncalibrated radiocarbon years BP.
The evidence suggests the posts were chopped down and immediately placed in the ground.
"It looks like it was done quickly, perhaps in response to some perceived threat," Hogg says.
When you do that, you can get a calendar age range of plus or minus 70 years.Caitlin Buck, Department of Probability and Statistics, University of Sheffield, U. - excellent website maintained by Utz Böhner, Daniel Schyle and Steffen Steiner in Germany.