Field trip to explore the sites and monuments in the Avebury area - Windmill Hill, West Kennet Long Barrow, the Sanctuary, Silbury Hill, West Kennet Avenue and the Avebury Circles, in particular to study the rock types chosen.
The image below was taken in West Kennet Avenue shows some interesting striations, these features were noted on a number of the standing stones.
Similar striations have been noted on Hautville's Quoit, associated with the Stanton Drew stone circle monument in Northeast Somerset (seen below on the right hand side of the image), also worthy of note is the similarity in the rock colouration.
The images below were also taken of stones in the West Kennet Avenue and show more similarities to the stone, Hautville's Quoit.
The evidence seen in the field would appear to suggest that the likely source for Hautville's Quoit rock type as being sarsen and to have originated from the Wiltshire region, possibly from Fyfield Down. Mercer carried out an excavation of the Quoit in 1969 and attributed the stone as being of ' Wiltshire sarsen stone' origin.
Mercer, R. 1969. Hautville's Quoit Excavation Notes includes Clark, A.J. Geophysical Survey Report (Unpublished).