"The shafts are vast, each more than 5 metres deep and 10 metres in diameter. Approximately 20 have been found and there may have been more than 30. About 40% of the circle is no longer available for study as a consequence of modern development."
perhaps this is a typo, but it sounds more like a pit, than a shaft.
"The shafts are vast, each more than 5 metres deep and 10 metres in diameter. Approximately 20 have been found and there may have been more than 30. About 40% of the circle is no longer available for study as a consequence of modern development."
perhaps this is a typo, but it sounds more like a pit, than a shaft.