Side view of the south-eastern chamber looking south-west
 
The University of Bristol News reports on the complex prehistoric patterns discovered around the site of ancient Welsh burial chamber –
 
A team of archaeologists, led by a researcher from the University of Bristol, has uncovered the remains of a possible Stonehenge-type prehistoric earthwork monument in a field in Pembrokeshire.
 
Members of the Welsh Rock art Organisation have been investigating the area around the Neolithic burial chamber known as Trellyffaint – one of a handful of sites in western Britain that has examples of prehistoric rock art.
 
The site of Trellyffaint dates back at least 6,000 years and has been designated a Scheduled Monument. It is in the care of Welsh heritage agency Cadw. The site comprises two stone chambers – one of which is relatively intact. Each chamber is set within the remains of an earthen cairn or mound which, due to ploughing regimes over the centuries, have been slowly uncovered.
 
More here.