The Lower Luggy long barrow was first recognised as a cropmark feature and was later surveyed and finally trenched in 1994.
The barrow survives as a pear-shaped mound some 60m north-east to south-west by 20m, and only 0.2-0.3m high. Underlying this is a tapering U-plan ditch 33m long, 9.0m wide at the apparently open north-east end and 6.0m wide at the rounded south-west end. This ditch held a palisade which presumably revetted the body of the barrow. The open north-east end may have been closed by a cross ditch, producing a forecourt. There was some evidence for a small cairn or stony core underlying the barrow.
Radiocarbon dating indicates that the barrow was raised in the period 3700-3400BC.
A roughly contemporary Neolithic ditched enclosure has been excavated some 50m to the north-west (NPRN 309385).
A probable Early Medieval square ditched funerary monument lies to the north-east of the long barrow (NPRN 407276).
