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A revised stratigraphy and sedimentology of the Abergwesyn–Pumpsaint area, Mid‐Wales
Author(s) -
Mackie A.,
Smallwood S.
Publication year - 1987
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350220506
Subject(s) - sedimentology , lithostratigraphy , geology , palaeogeography , stratigraphy , paleontology , sedimentary rock , structural basin , tectonics , geomorphology , volcanism
An Ashgill and Llandovery sedimentary succession north‐west of the Tywi Axis has been remapped at a scale of 1:10000. A revised lithostratigraphy is suggested, based on more rigorous sedimentology, and is integrated with earlier biostratigraphic work. The lithostratigraphy is compared with that from other parts of the Welsh basin and the sediments are related to palaeogeography and tectonics. Ashgill sediments indicate a shelf–slope environment which became shallower during the Hirnantian due to glacio‐eustatic regression. During the early Llandovery, sedimentation took place in deeper water mainly on a slope, while middle and upper Llandovery sediments record deposition in a slope to basin environment.