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Rhiwlas limestone

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A correlation in cartoon form of upper Ordovician – lower Silurian strata f...
Published: 19 July 2013
to Cautleyan zone 1 and the possibility that the base Ashgill unconformity may descend into this interval is not represented. Sandstones: a – Cefn Formation; b – Powis Castle conglomerate; c – Garn Wen sandstone (Hirnantian); d – Glyn Formation. Limestones: e
Journal Article
Published: 01 May 1990
Journal of the Geological Society (1990) 147 (3): 537–547.
..., the Rhiwlas and Ddolhir Limestones and the Abercwmeiddaw Group. Further south the base is marked 542 N . H. WOODCOCK Fig. 5. Definition of Welsh supergroups by selected units at their base and top along the section-line in Fig. 4. Abbreviations are: BB, Blaen-y-Cwm Beds; BM, Bodeidda Mudstone; BS, Bentleyford...
Journal Article
Published: 01 November 2000
Journal of Paleontology (2000) 74 (6): 1148–1160.
... ) and the Keisley and Rhiwlas limestones (Rawtheyan) of north England and Wales ( Orchard, 1980 ). Only a few specimens of this species have been recovered and, like the one illustrated, they are all fragmentary. Conodonts assigned to this species have been reported from rocks as old as late Mohawkian...
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Journal Article
Published: 27 March 2012
Geological Magazine (2012) 149 (6): 964–988.
... & Rong, 1991 ); JFD – Jerrestad Fm, Bornholm, Denmark: Kielan ( 1960 ); RL – Rhiwlas Limestone, Wales: Whittington ( 1968 with emendations by Owen, Harper & Rong, 1991 ); JFS – Jerrestad Fm, Skåne, Sweden: Kielan ( 1960 ); UT – Upper Tangtou Fm...
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Journal Article
Published: 19 July 2013
Geological Magazine (2014) 151 (3): 447–471.
... to Cautleyan zone 1 and the possibility that the base Ashgill unconformity may descend into this interval is not represented. Sandstones: a – Cefn Formation; b – Powis Castle conglomerate; c – Garn Wen sandstone (Hirnantian); d – Glyn Formation. Limestones: e...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.3
EISBN: 9781862393882
...). They are interpreted as having been deep-neritic sediments of a low-energy input. The argillaceous limestones occur as local facies overlying Caradoc rocks. The best known is the Rhiwlas Limestone Member (Rawtheyan on Woolstonian) of the Moelfryn Mudstones Formation around Bala ( Bassett et al. 1966...
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Series: Geological Society, London, Special Publications
Published: 10 May 2023
DOI: 10.1144/SP532-2022-235
EISBN: 9781786209641
... with mudstone partings (Rhiwlas Limestone) at the base of the succession in the Bala district ( Fig. 3 , column 3) has yielded ordovicicus Biozone conodonts ( Owens et al. 2000 ). There is no definite evidence for the Pusgillian Stage or the linearis or complanatus graptolite biozones, although some...
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