The tomb was discovered during routine land improvement work, according to RTE, when a large stone was lifted up to reveal a ‘slab-lined chamber’ underneath.
An adjoining sub-chamber was found at what appeared to be the front of the tomb, containing what is presumed to be human bone fragments.
A smooth oval-shaped stone was also uncovered, although its purpose is not yet clear.
Archaeologists from the National Monuments Service and the National Museum of Ireland visited the site and believe the tomb likely dates to the Bronze Age, which ran from 2000 to 500BC.
But it could be even older given its ‘highly unusual’ design.
‘Given its location, orientation and the existence of the large slab, your initial thought is this is a Bronze Age tomb,’ archaeologist Mícheál Ó Coileáin told RTE.
‘But the design of this particular tomb is not like any of the other Bronze Age burial sites we have here,’ he added.
‘It’s possible that it’s earlier but it’s very difficult at this early stage to date it.’
Fellow archaeologist Breandán Ó Cíobháin told the outlet the tomb appears ‘completely untouched,’ and its contents remain in their original state.
‘That is very rare,’ Ó Cíobháin said. ‘It is an extremely significant find as the original structure has been preserved and not interfered with, as may have occurred in the case of other uncovered tombs.’
The discovery could prove invaluable to the understanding of prehistoric burial rituals, he said.
Bronze Age tombs have been found in southwest Ireland before, particularly in Cork and Kerry.
They’re typically ‘wedge tombs,’ which narrow at one end and protrude above ground.
‘But this one is completely concealed, Ó Coileáin told The Times.
Wedge tombs mostly face the west and southwest, possibly representing ‘celestial or lunar alignments,’ Ó Cíobháin theorized.
Because so much of the newly discovered tomb is underground, ‘it is difficult to fully assess the layout,’ he said.
‘It is very well built, and a lot of effort has gone into putting the large cap stone over it,’ Ó Coileáin told the Irish Times. ‘It’s not a stone that was just found in the ground. It seems to have some significance.’