A Neolithic stone circle at Waun Mawn, in the Mynydd Preseli, west Wales, has been proposed as the original location of some dolerite megaliths at Stonehenge, including one known as Stone 62. To investigate this hypothesis, in-situ analyses, using a portable XRF, have been obtained for four extant non-spotted doleritic monoliths at Waun Mawn, along with two weathered doleritic fragments from a stonehole (number 91). The data obtained have been compared to data from spotted and non-spotted dolerite outcrops across the Mynydd Preseli, an area known to be the source of some Stonehenge doleritic bluestones, as well as data from in-situ analysis of Stone 62 (non-spotted dolerite) and ex-situ analysis of a core taken from Stone 62 in the late 1980′s.

Recently, Stone 62 has been identified as coming from Garn Ddu Fach, an outcrop some 6.79 km to the east-southeast of Waun Mawn. None of the four dolerite monoliths at Waun Mawn have compositions which match Stonehenge Stone 62, and neither do the weathered fragments from stonehole 91. Rather the data show that the Waun Mawn monoliths, and most probably the weathered stonehole fragments, can be sourced to Cerrig Lladron, 2.37 km southwest of Waun Mawn, suggesting that a very local stone source was used in construction of the Waun Mawn stone circle. It is noted that there is evidence that at least eight stones had been erected and subsequently removed from the Waun Mawn circle but probability analysis suggests strongly that the missing stones were also derived, at least largely, from Cerrig Lladron.

在威尔士西部 Mynydd Preseli 的Waun Mawn 的一个新石器时代石圈被提议作为巨石阵中一些辉绿岩巨石的原始位置，其中包括被称为 Stone 62 的巨石。为了研究这一假设，使用便携式XRF 已在 Waun Mawn 获得了四个现存的未发现的玄武岩单体，以及来自石孔的两个风化玄武岩碎片（编号 91）。获得的数据已与 Mynydd Preseli 的斑点和无斑点辉绿岩露头的数据进行了比较，该地区已知是一些巨石阵玄武岩青石的来源，以及来自Stone 62原位分析的数据（无斑点）辉绿岩）和1980 年代后期取自 Stone 62 的岩心的异地分析。

最近，已确定 62 号石头来自 Garn Ddu Fach，这是一个位于 Waun Mawn 东南偏东约 6.79 公里处的露头。Waun Mawn 的四块辉绿岩巨石中没有一个具有与巨石阵 62 相匹配的成分，91 号石洞的风化碎片也没有。相反，数据显示 Waun Mawn 巨石，很可能是风化的石洞碎片，可以来自 Cerrig Lladron，位于 Waun Mawn 西南 2.37 公里处，表明在 Waun Mawn 石圈的建设中使用了非常当地的石源。值得注意的是，有证据表明至少有八块石头被竖立起来，随后从 Waun Mawn 圈中移除，但概率分析强烈表明，丢失的石头也至少大部分来自 Cerrig Lladron。