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Syn-depositional faulting and valley-fill breccias in the Permo-Triassic of Arran

Synopsis Two outcrops of New Red Sandstone breccia at Brodick, Arran, are interpreted to be filling two steep-sided valleys. Valley formation is contrasted to the usual style of sedimentation of the enclosing Brodick Breccia, which was deposited on a low relief alluvial plain by a braided river system. The valleys are inferred to be a consequence of faulting creating local topography on the plain. The diagenesis of the New Red Sandstone breccia and the surrounding strata is described, to show that early lithification aided the formation of both steep valley walls, and the large blocks of sediment now filling the valleys.