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Derwen Group

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Journal Article
Published: 01 August 1990
Journal of the Geological Society (1990) 147 (4): 693–701.
.... In the murchisoni through linnarsoni biozones, turbidites dominate the intrabasinal troughs, forming the Denbigh Grits Group. By contrast, laminated hemipelagite dominates the sequences 693 694 A . J . DIMBERLINE E T A on the intervening Derwen Ridge palaeohigh, forming 100% of the sequence near Llangollen...
Journal Article
Published: 01 May 1990
Journal of the Geological Society (1990) 147 (3): 537–547.
... detailing of litho- and biostratigraphy. By contrast, in this paper I view Welsh stratigraphy in a broad perspective, at the lithostratigraphic level of groups or supergroups (here newly designated). This approach has been stimulated by the use of depositional sequence analysis (Mitchum et al. 1977...
Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.4
EISBN: 9781862393882
... and Přídolí series are all correlated with graptolite biozones, though in the British succession the uppermost Ludlow and Přídolí are non-graptolitic. Other macrofossil groups used for correlation include brachiopods, trilobites and corals. These, particularly brachiopods, are useful in the shallower marine...
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Journal Article
Published: 01 August 1976
Journal of the Geological Society (1976) 132 (4): 399–415.
... Ankogel groups, the Eastern Alps Jb geol Bundesanst Wien 1971 114 121 272 Corbett K. D. Open-cast slump sheets and their relationship to sandstone beds in an upper Cambrian flysch sequence, Tasmania J sedim Petrol 1973 43 147 59 Cummins W. A. The Lower Ludlow Grits in Wales...
Series: Geological Society, London, Special Publications
Published: 01 January 2004
DOI: 10.1144/GSL.SP.2004.222.01.11
EISBN: 9781862394704
... at the margin of the Midland Platform and probably led to an increase in the volumes of coarse clastic supply to the basin in the Caban-Ystrad Meurig System (Fig. 2 ). Unconformities are also found in the Berwyn Hills and Derwen High at this time ( Wills & Smith 1922 ; Campbell 1983 ). Later Aeronian...
Series: Geological Society, London, Special Reports
Published: 01 January 1992
DOI: 10.1144/SR21.1
EISBN: 9781786202840
... Group on the Ordovician-Silurian Boundary, a full account of which was given by Cocks & Rickards (1988). The boundary is placed in the rock at the base of the Parakidograptus acuminatus Biozone with the ‘golden spike’ in a boundary stratotype at Dob’s Linn in the Southern Uplands of Scotland...
Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.6
EISBN: 9781862393882
.... Plate 11. Glaciated trap topography in St-Johns-in-the-Vale, near Keswick, (Cumbria, Northern England). Formed of andesite sheets (the crags) separated by thin layers of stratified andesitic volcaniclastic material (the benches). The sequence is within the lower part of the Borrowdale Volcanic Group...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.3
EISBN: 9781862393882
... Cambrian, but later a lithological sequence from the Lingula Flags to the Bala Group was established ( Sedgwick 1852 ). The Ordovician System has been extended downwards, following the recommendation that the lower boundary be moved to the base of the Tremadoc ( Norford 1988 ), thus removing the series...
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