Geologist TJ Jehu
One of my great academic heroes is TJ Jehu, who was decades ahead of his time in his analysis of the glacial landforms and features of North Pembrokeshire.
The Glacial Deposits of Northern Pembrokeshire. By T. J. Jehu, M.D. (Edin.), M.A. (Camb.), F.G.S., Lecturer in Geology at the University of St Andrews. 1904. TRANS. ROY. SOC. EDIN., VOL. XLI. PART I. (NO. 4).
I was looking something else up, but was reminded of the fact that he was Scottish and knew his Scottish geology rather well. He flagged upm with some enthusiasm the widespread occurrence of Scottish erratics in North Pembrokeshire, including some from the Western Isles.
He also flags up the occurrence of Ailsa Craig microgranite widely across North Pembrokeshire -- and his listing of erratics of course has a bearing on the recent Altar Stone debate -- confirming that material from Western Scotland could well have been transported southwards -- and indeed up the Bristol Channel -- by the body of ice that we now call the Irish Sea Ice Stream.
Jehu also has no time for the ice rafing idea. He is quite sure that the abundant erratics in the shore zone around the Pembrokeshire coast have simply fallen from the till and other glacial deposits as coastal exposures have been eroded away.
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