found: Work cat: Gibson, A.M. Stonehenge & timber circles, 1998.
found: Ox. companion archaeology, 1996:p. 692 (stone, earth and wood were used by prehistoric peoples to create the earliest ritual enclosures; at times these materials were used to create circles within circles)
found: English Heritage website, 28 Jan. 2008:Timber Circles page (A timber circle is the foundation of a large wooden structure)
found: Wikipedia, 28 Jan. 2008(Timber circles in the British Isles date to the late Neolithic and early Bronze Age; they are circular arrangements of wooden posts interpreted as being either complexes of freestanding totem poles or as the supports for large circular buildings)