Fourknocks Passage Tomb dates to 3000–2500 BC. It was unknown to archaeology until 1949, when a woman making a visit to
Newgrange mentioned, "there are mounds like this on my uncle’s farm." It is not marked on any of the old
Ordnance Survey maps. It was first excavated from 1950 to 1952 by PJ Hartnett. He found
cists,
grave goods including a foot bowl and a carved antler pin, urns containing cremated remains and a
posthole. Unlike other
passage graves, the tomb at Fourknocks is not believed to have been covered over with stones. A wooden pole may have held up a wooden or animal-skin roof. During reconstruction after excavation, a concrete roof was placed over the chamber for protection. ==Description==