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Google Earth Plug-in: Carn Menyn - Possible bluestones rock outcrops for the Stonehenge

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Carn Menyn is a grouping of craggy rock outcrops or tors in the Preseli Hills in the Welsh county of Pembrokeshire.

The name means "Butter Rock". It is sometimes called Carn Meini ("Rock of Stones"), but this is a modern corruption of the original name. It sits on top of the Preseli ridge, close to the stone setting of Bedd Arthur and is believed by some to have been the main source for the bluestones used at Stonehenge. It consists of an outcrop of white spotted dolerite similar to that of other tors in the area, and several other prehistoric sites have been identified nearby. The mountain-top setting provides commanding views over the Gower peninsula and across Cardigan Bay to the Llŷn Peninsula.

Pembrokeshire had been considered the source of the bluestones since Sir Andrew Ramsey first suggested it as a contender in the mid-nineteenth century. In the early 1920s HH Thomas was able to resolve this to the Preseli Hills and in 2005 work led by Timothy Darvill and Geoff Wainwright suggested Carn Menyn as the primary quarry. This is disputed by others, and Williams-Thorpe and others from the Open University have suggested that the Stonehenge bluestones came from many different places, with Carngoedog the most likely source for the spotted dolerites.

Survey work between 2002 and 2004 by the Strumble-Preseli Ancient Communities and Environment Study (SPACES) recorded an enclosure on the upper part of the outcrop consisting of a steep-sided promontory with a bank of stones across its neck. Although only around 3,500 square metres in area the enclosure contains several dolerite outcrops, each naturally fractured into shapes that could be formed into columns. Semi-worked megaliths lay scattered around apparently having been simply levered out from the larger outcrops. It is debatable whether these "semi-worked megaliths" are prehistoric or recent, since this area has been used by the farming community for at least 300 years for the collection of stone gateposts, lintels and building slabs.

Geochemical analysis has shown that some of the bluestones from the inner horseshoe at Stonehenge probably came from Carn Menyn, Carngoedog, Carnbreseb, Cerrigmarchogion and other sites in the Preseli Hills, while rhyolite fragments may have come from Carnalw and further afield.

Evidence for prehistoric and later exploitation of the stone at Carn Menyn has been found despite the site's remoteness. Two nearby chapels and many houses in the area were built from Carn Menyn stone. However, this stone was not used preferentially in megalithic or ritual structures -- stone from all of the outcrops or tors on Mynydd Preseli has been used in buildings and field boundaries, so long as access by horse-drawn sleds and carts was possible.

In April 2005 an excavation at the site clarified the extent of the enclosure but did not retrieve any cultural material.

http://en.wikipedia.org/wiki/Carn_Menyn

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