Material for dating from these settings is very limited - there are no reliable determinations at all from the Q and R Holes (rejected results), which is unfortunate as these are stratigraphically the earliest stone settings.
Two samples were analysed from the Bluestone Circle and one from the Bluestone Horseshoe (photo). The only stratigraphic relationship between these settings and other dated parts of the Monument are that they must be contemporary or later than the Sarsen Trilithons, and the Circle must be earlier than the Q Holes.
Analysis of the results provides best estimates for the date of construction of the Bluestone Circle of 2280-2030 cal BC, and of 2270-1930 cal BC for the construction of the Bluestone Horseshoe (see probability distributions).
The Sarsens
The Avenue
Results
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