Abstract
LONDON. Geological Society, June 26. R. 0. Roberts: The geology of the district around Abbey-Cwmhir (Radnorshire). This paper deals with an area of about 30 square miles in north-western Radnorshire. The rocks belong to the Bala, Valentian, and Wenlock Series. Only the lowest beds of the Birkhill Stage are exposed, and they are overstepped by the Tarannon Stage, which, over most of the area, rests directly on folded Bala rocks. The Bala rocks are exposed along the north-eastern extension of the Towy antieline; but, in this district, the anticlinal axis is partly replaced by an import- ant strike-fault, which hades westwards. Subsidiary folds may be recognised within the Bala rocks. The axes of these folds are parallel to the general strike of the strata, although there is a change in the direction of pitch around Nantmel. The Bala rocks were folded in pre-Tarannon times, but broad shallow folds in the Tarannon and Wenlock rocks indicate that there has been a repetition of folding along the same lines at different periods. C. A. Matley and A. Heard:
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Societies and Academies. Nature 124, 166–168 (1929). https://doi.org/10.1038/124166a0
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DOI: https://doi.org/10.1038/124166a0