My thanks to Adrian James for a batch of splendid photos of other South Pembrokeshire erratics to go with the one at Loveston. I won't reproduce all of them here -- but encourage you to take a look at Adrian's site:
This is an interesting comment from Adrian about the Flimston Collection:
Flimston Chapel churchyard (SR92399558). There is a substantial collection of erratics in this churchyard. Some have been used as headstones for the graves of members of the Lambton Family who died in military service. Others have been left sitting in one corner of the enclosure. All of these stones arrived in the churchyard when the chapel was renovated and re-consecrated in 1903. There are 7 of them. A pamphlet, which describes the features and memorials in the yard, printed at the time of the opening of the chapel in about 1914, gives us these vague details:
No. 1 Boulder, at the head of Lady Victoria Lambton's grave was taken from just opposite Flimston Cottage. A 'brecciated spherultio, albite, trachyte or rhyolite.' Many occur in Pembrokeshire. This one 'seems to fit best with those of Romans'Castle in the character of its spherulites and groundmass.' Most of these appear to have travelled over 30 miles from the N. West separated from their parent rocks by St Brides Bay and Milford Haven, and by a considerable mass of high ground.........
[Flimston Cottage stood at SR927955, about 0.3 km ESE of the chapel and just north of the old clay pits.]
......No. 2 Boulder, from Pwlslaughter, which stands in the opposite North corner. [Bullslaughter, SR942944 - approximately 2.25 km SE]
No. 3 Boulder from Bulliber Farm [About 2.25 km WNW, at SR905968]
No. 3 Boulder from Merrion pond. [ About 2 km NE].
No. 5 Boulder from Lyserry Farm
No. 6 Boulder from Lyserry Farm.
No.7 Boulder from Lyserry Farm.
[Lyserry is about 3.4 km ENE of Flimston chapel, at SR9556967]
Another erratic -- also from Loveston Farm? The nice thing about the erratics of this area is that they are pretty obvious -- the only local rock type is Carboniferous Limestone -- so anything that isn't limestone is an erratic......