Abstract
Observations on Late Mississippian strata are summarized including: the Brigantian Cefn Mawr Limestone and Minera formations; and the Namurian Pentre Chert and Cefn‐y‐Fedw Sandstone formations. Many of those observations relate to transitory, commercial quarry exposures, especially in the Cefn Mawr Limestone Formation. During the Late Mississippian, the area was located in proximity to an unstable northeast‐facing platform edge and slope on which earlier workers postulated a megaslide, probably related to the Nant Figillt Fault zone and affecting the Cefn Mawr Limestone and Pentre Chert formations. This study reinforces that general model and highlights new evidence indicative of mass wastage along the platform margin including: synsedimentary faults, slides and slumps. Penecontemporaneous submarine crevassing occurred in the Pentre Chert Formation. Limestone beds previously described as tidal or storm‐related sand bars in the Cefn Mawr Limestone Formation are instead considered as gravity‐driven resedimented deposits. Channelling in relatively deep water facies of the Cefn Mawr Limestone, Pentre Chert, and Cefn‐y‐Fedw Sandstone formations occurred.
Published Version
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