A new article by Dyfed Elis-Gruffydd, John Downes and myself, entitled "Quaternary Events at Craig Rhosyfelin, Pembrokeshire" is now published. Here is the Abstract:
The Afon Brynberian valley is claimed to contain Britain’s most important Neolithic quarry, used for the extraction of bluestone orthostats destined for Stonehenge. Archaeologists argue that an exposed rock face within a meltwater channel at Craig Rhosyfelin is a quarried surface, and that an eight-tonne block found five metres away was prepared for transport but then abandoned. Site investigations have revealed scoured surfaces, faceted and abraded erratic boulders, glacial till, fluvioglacial sands and gravels, and widespread rockfall and solifluction deposits. All the features associated with the “proto-orthostat” are considered to be natural. There are currently no visible prehistoric landforms or sediments that are demonstrably anthropogenic in origin.
Source: Quaternary Newsletter No 137 (October 2015). Articles in this journal are not published online, and so the new paper is reproduced -- with different format -- on the Scribd web site. Unfortunately the illustrations are not high definition, because of constraints imposed by the server. However, nearly all of them have previously been published on this blog.
A facsimile version will shortly be published on Researchgate.