Abstract
AbstractAn investigation has been made of a structural complex in southwest Wales. The complex comprises a zone of folds and faults within Upper Carboniferous rocks of the Variscan fold belt, interpreted to have formed by tectonic deformation of a large channel sandstone. Sedimentary features include basal and internal erosion surfaces, an onlapping channel fill, lens‐shaped beds of mudstone with slumped layers, and discontinuous conglomerate and coal beds. These features strongly influenced ensuing tectonism, with the channel axis now coincident with a composite anticline. Some bedding discontinuities acted as surfaces of decollement, and lens‐shaped beds were folded disharmonically. This example will provide an analogy for use in other deformed sedimentary terrains, where channels may occur.Acknowledgements. I wish to thank Drs M. C. Cooper, R. M. Tucker and B. P.J. Williams for their valuable comments on the manuscript. I also acknowledge receipt of a NERC studentship held at the University of Bristol, supervised by Dr P. L. Hancock.
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