The structure of the Taff Gorge area, Glamorgan, and the stratigraphy of the Old Red Sandstone—Carboniferous Limestone transition
- 1 January 1973
- journal article
- research article
- Published by Wiley in Geological Journal
- Vol. 8 (2) , 345-374
- https://doi.org/10.1002/gj.3350080212
Abstract
Lithostratigraphical and structural mapping of the Taff Gorge area, Glamorgan, has revealed a number of E‐W trending folds and thrusts. These were developed during the early stages of the Hercynian deformation as a result of an approximately N‐S principal compressive strain. Coeval with the folding, a conjugate set of sub‐vertical wrench faults, symmetrical about the principal compressive strain, divided the area into tectonic blocks and to some extent controlled the progressive development of folds and thrusts within the individual blocks. Later Hercynian deformation gave rise firstly to oblique‐slip and finally to dip‐slip movement on the faults.The lithological transition between the Old Red Sandstone and Carboniferous Limestone is described in detail, including the diagenetic history of the limestones. Marine horizons are shown to be present within the dominantly fluviatile Old Red Sandstone, and the base of the Carboniferous Limestone is defined at the base of the lowest limestone of the continuous marine sequence. Studies of spores, macroplants, conodonts and brachiopods indicate that the whole of the Upper Old Red Sandstone and Lower Limestone Shale in the Taff Gorge are of Tournaisian age.Keywords
This publication has 14 references indexed in Scilit:
- Conodont Zonation of the North American MississippianPublished by Geological Society of America ,1970
- British Avonian (Carboniferous) Conodont faunas, and their value in the local and intercontinental correlationBulletin of the British Museum (Natural History). Geology. Supplement, 1969
- Hymenozonotriletes lepidophytus kedo, its distribution and significance in relation to the Devonian-Carboniferous boundaryReview of Palaeobotany and Palynology, 1967
- A Modified Staining Technique for Carbonates in Thin SectionNature, 1965
- Summer (1964) Field Meeting in South WalesProceedings of the Geologists' Association, 1965
- Upper Devonian Spores from the Canning Basin, Western AustraliaMicropaleontology, 1962
- The last toothed Productellinae in EuropePalZ, 1957
- An Old Red Sandstone-Carboniferous Limestone Series Junction at Tongwynlais, North of CardiffGeological Magazine, 1956
- The structure of GowerQuarterly Journal of the Geological Society, 1940
- The Carboniferous Limestone Series on the South-Eastern Margin of the South Wales CoalfieldQuarterly Journal of the Geological Society, 1917