Recumbent-stone circles usually have twelve stones, with one
(or occasionally more) especially large stone flat on the ground,
while the others are standing. The horizontal stone is often of a
different rock quarried far away, and always along the side of the
circle facing in the arc between south and southwest. These stone
circles date probably from the very late Neolithic and early
Bronze Age, from 2700 - 2000 BC. Another type of circle is
the Four-Poster, that is also prevalent in other parts of
the Scottish Mainland like Perthshire.