The fort was described by Craig Weatherhill as "a bivallate Iron Age hill fort 230m in diameter. The ramparts, each about 3.0m high externally, are widely spaced and fronted by ditches (often flooded) 1.8m deep. The north side of the fort is well preserved, but to the south of the lane the defences have been ploughed almost flat. The northern half of a rectangular annexe survives on the west side of the fort, the rest was obliterated by the building of Sandylands Farm. On the opposite side of the fort cropmarks and traces of two contiguous annexes have been detected. Excavations found the inner ditch to have been cut 2.8m into the bedrock. It also showed that the earliest occupation of the site was during the 11th or 10th century BC. It is not known if this was before the defences were built. The fort has long been a leading candidate as the location of Arthur's home fort of Celliwig (along with Castle Canyke), but only two post-Roman sherds have been unearthed."
- Ordnance Survey: Landranger map sheet 200 Newquay & Bodmin ISBN 978-0-319-22938-5
- Cornish Guardian page 8 Wednesday July 142010
- "Weatherhill, Craig (1985) Cornovia: Ancient Sites of Cornwall & Scilly. Cornwall Books: revised 1997 & 2000, ISBN 1-871060-31-1
- Mills, Henrietta (1977), "Excavations at Killibury Hillfort, Egloshayle 1975–6" (PDF), Cornish Archaeology, 16: 89–121[permanent dead link]
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