South cairn is over 20 metres long.

Bookan

The Bookan type is named after a cairn found to the north-west of the Ring of Brodgar in Orkney, which is now a dilapidated oval mound, about 16 metres in diameter. Excavations in 1861 indicated a rectangular central chamber surrounded by five smaller chambers. Because of the structure's unusual design, it was originally presumed to be an early form. However, later interpretations and further excavation work in 2002 suggested that they have more

1.Previous
3.Next