It is a circular clay and gravel bank covered with grass, still some 1.5 metres (5') high and revetted externally by stone walls, which surround a level area some 54 metres (177') in diameter.

[citation needed] The original use of this site is uncertain although it may have been a religious sanctuary.

The earliest bank and ditch belong to the end of the neolithic period (2500-2000 BC).

[1][2][3] During the Iron Age, the present wall was built, and it was rebuilt in Roman times and later.

Another path follows the low ridge, southwest over stiles to the Bryn Gwyn stones, or northeast, past the site of the former stone circle of Tre'r Dryw Bach, some ½ mile (800 metres) to Caer Lêb where it meets a minor road with limited car parking space.