Rhosyfelin

Rhosyfelin (Welsh: Rhos-y-Felin) is a rocky outcrop on the Preseli Hills in Pembrokeshire, Wales. The site lies on the western flank of the Preseli ridge and forms part of the geologically diverse landscape from which the so-called Preseli bluestones originate. The bluestones are a group of Neolithic stones associated with Stonehenge in England and include rocks such as dolerite and rhyolite.

In the early 21st century, Rhosyfelin gained prominence in the debate over the provenance of Stonehenge's bluestones. A research team led by archaeologist Mike Parker Pearson conducted fieldwork at Rhosyfelin and reported evidence that the outcrop had been worked in the Neolithic: tool marks on bedrock, quarry scars, and a deposit of debitage consistent with on-site extraction of stones.

The interpretation that some Stonehenge bluestones were quarried at Rhosyfelin has been influential but also controversial. Critics have urged caution about dating, attribution, and the extent of quarrying at the site, and other studies have identified additional or alternative sources within the Preseli Hills. The discussion remains part of a broader examination of Neolithic quarrying and long-distance stone transport to Stonehenge.

Today, Rhosyfelin is treated as an important archaeological site on the Preseli Hills, cited in debates about the origins of the bluestones and the practices of Neolithic communities in south Wales.