Although Exmoor witnessed the construction of many monuments during the Bronze Age, only two stone circles survive in this area, the other being Withypool Stone Circle. The Porlock circle is about in diameter and contains thirteen green micaceous sandstone rocks; there may originally have been more. Directly to the north-east of the circle is a cairn apparently connected to a linear stone row. No evidence has been found that allows for absolute dating of the monument's construction, although archaeologists have suggested that the cairn dates from the Early Bronze Age, the circle being a Middle Bronze Age addition.