Very difficult to make out what we have here. Recorded under the cover-all category of 'mound' (there is a reference to it on excavations.ie as Corduff mound), it's been hacked into on its north-west arc. Very overgrown and in a swampy corner of a field in a housing estate, we could barely make it out in the low evening sun and the decaying vegetation. I guess about 2 metres high and maybe 25 in diameter.
Now a traffic island in a car park in an industrial estate, this mound has been rounded off and prettified. I couldn't find any excavation notes, surprising as I would have thought an excavation was called for when working so close to a national monument. It's over 3 metres tall and about 50 metres diameter.