Using a variety of scientific techniques, archaeologists have come to the conclusion that the trees used in the construction of the monument had all been felled in the same year, 2049 BC, whilst the condition of the sapwood indicated that it had been cut down in spring or early summer. According to writer Charlie Watson, "Confirming that all the trees had been felled at the same time suggested strongly that the building of the circle was a single event. Further, a great amount of work would have been involved in felling, transporting, preparing and erecting the timbers, so it was likely too that the job was done by a large number of people - possibly an entire community or an extended family - working together."