A rhyolite boulder collected by R. S. Newall in 1924 from an excavation at Stonehenge has been pivotal to arguments concerning glacial versus human transport of the bluestones to Stonehenge. Initial studies suggested that the boulder came from north Wales, and hence was a probable glacial erratic. New petrographic and geochemical analyses however support it being from Craig Rhos-y-Felin in west Wales, the source of much debitage recovered from Stonehenge. Examination of the form and surface features of the boulder provides no evidence for it being erratic. Instead, it is considered to be one more piece of debitage probably derived from a broken-up monolith.

中文翻译：

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威廉·霍利 (William Hawley) 于 1924 年对巨石阵出土的一系列青石进行了岩性描述和出处，对人类与冰块运输关于纪念碑青石巨石的争论产生了影响

RS Newall 于 1924 年在巨石阵发掘中收集到的一块流纹岩巨石，对于有关冰川和人类将青石运输到巨石阵的争论至关重要。初步研究表明，这块巨石来自威尔士北部，因此可能是冰川作用的不稳定物。然而，新的岩石学和地球化学分析支持它来自威尔士西部的克雷格·罗斯·伊·费林，这是从巨石阵中回收的大量债务的来源。对巨石的形状和表面特征的检查没有提供任何证据表明它不稳定。相反，它被认为是可能源自破碎的整体的另一笔借记。