Low circular flat-topped mound (.75m high)
Unfortunately it appears that this structure is not listed as part of the National Inventory of Architectural Heritage.
This structure is part of the Record of National Monuments and Places. The black box below is this structure's reference number in the Record of National Monuments and Places, and further details of this site can be found on archaeology.ie. Unfortunately their website is not working fully and only the map viewer is available at this time.
archaeology.ie will provide a comprehensive description of the site and structure, including details of known excavation work carried out to date.DU004-021
There are a number of resources which will enable you to find out more about this structure including your local library, the Fingal Archives, the National Museum, the National Library and the Trinity Map Library, to name a few.
A new section will be added shortly to this website which will give more comprehensive list of other information sources including short summaries of what sort of information you are likely to be able to find through these sources.