Plumstone Mountain

Nearest town:
Haverfordwest (8km SE)
OS reference:
SM916233
OS sheets:
157, 158
Latitude:
51° 52' 7.62 N
Longitude:
5° 1' 38.82 W
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Images

Image of Plumstone Mountain (Round Barrow(s)) by AdrianStallwood

The tor at dusk. The modern petrochemical industrial complex of Milford Haven can be seen like burning torches on the horizon

AdrianStallwood
AdrianStallwood Jan 12, 2025

Articles

Plumstone Mountain

AdrianStallwood
AdrianStallwood Jan 12, 2025

Went out tonight for a spot of nocturnal cairn bothering on Plumstone Mountain. Access is simple as there is a large car park. Popular site with dog walkers.

The rocky tor is really impressive despite being quite small in terms of ground area. It’s an outcrop of Ordovician rhyolite born in the belly of a volcano, with the same stuff outcropping also at nearby Treffgarne and Roch. There are great all round views to the Preselis and across to the Bristol Channel (will post more images on daytime visit).

The common is a 145 hectare Site of Special Scientific Interest, with a variety of heaths and marshes. Sadly the enormous starling roost that was a winter highlight has moved off a few years ago.

Antiquarian wise, there are four barrows in very reasonable repair. Cook, writing in 2006 in the journal of the Pembrokeshire Historical Society, says that ‘there are two pairs of barrows located 400m apart from each other on an east-west alignment’. However, tonight, we could only find one of the more westerly pair, which should have been located in a very recently ploughed field.

Four barrows remain intact. There is an eastern pair right next to the rock (called Plumstone Central 1 and 2 on Coflein). One of them is on common land and has been walked, cycled and ridden over so many times it’s all smoothed over. It’s pair is just over the barbed wire fence nearby and heathered over.

Head down away from the tor on the big track to the right hand side, and follow the fence round to the third barrow which has it’s own gated enclosure (Plumstone West on Coflein).

The fourth barrow, a rocky one, is technically on Dudwell Mountain not Plumstone, and although topped with the trig point on the maps is trickier to access as it’s all covered in gorse and heather. We didn’t get there tonight so will update after returning. Interestingly, Coflein says ‘early reports speak of a “demolished cromlech” with a 2’ by 5’ chamber, however no identifiable remains of this were noted in 1966‘

Folklore

Plumstone Mountain
Round Barrow(s)
Rhiannon
Rhiannon Sep 4, 2006

There are a number of round barrows and cairns on this hilltop. A contributor to Notes and Queries (March 5th 1870) found some folklore referring to them in Fenton’s ‘Tour through Pembrokeshire’ (1811). “In the midst of this convulsed chaos (Plumstone Mountain) are three rocking-stones, and a cromlech ; and on the top of one of the highest fragments, in an excavation on the surface, I found water, said to be always there, and probably, as this was the 22nd of July, after a long run of dry weather.”

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