Ach, you Ballyclare fowk are ayeways wintin' things done yesterday!

If it is not in the book then maybe a memorial was erected only recently (after the NIFHS research period) or it is located elsewhere ...
[Addendum: The labelling for that plot is probably "AG2" - the 2nd letter matching the start of the surname.
It would be nice to know what the exact connection is ...]
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I saw that details of "The Hidden Graveyard" (No. 1?) have been published by NIFHS already.
Interesting to hear about the impending publication on (No. 2?) graveyard, below the church.
This was used from (at least) the 1870s, when space ran out in the original plots.
[The one-time very unkempt nature of this area matches Michael's description better than that of the main graveyard, though it got badly overgrown also (and memorials vandalised). There was a long ongoing issue over who should maintain these private lands (nominally the plot owners were responsible), now resolved as being the duty of Newtownabbey Council - following allocation of grants. When I visited in 2002 the grounds had been blitzed with "Agent Orange", a powerful biocide, and all looked like a scene from Apocaplypse Now!]
Be very wary of walking in that lower area. The mats of moss covering the paths have a habit of slipping en masse in wet weather.