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Merioneth

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Journal Article
Published: 16 February 1970
Quarterly Journal of Engineering Geology and Hydrogeology (1970) 2 (3): 183–194.
...John Graham Comrie Anderson, M.A., PH.D., D.SC., F.R.S.E. Summary The Ffestiniog Pumped Storage Scheme, in Merioneth, the first in Britain, is situated on Upper Cambrian and Ordovician sediments and metasediments, on Ordovician volcanics and fine-grained intrusions and on a granite laccolite...
Series: Geological Society, London, Special Reports
Published: 01 January 2000
DOI: 10.1144/SR24.7
EISBN: 9781862396920
... Ordovician in age. The Merevale Shale Formation of the Nuneaton and Dosthill Inliers (Column 41) overlie the Merioneth Series conformably and have yielded Rhabdinopora fabelliformis socialis from a horizon some 90 m above its base (Taylor & Rushton 1972, p.35), but the Merioneth-Tremadoc boundary...
FIGURES
Series: Geological Society, London, Special Reports
Published: 01 January 2011
DOI: 10.1144/SR25.2
EISBN: 9781862396937
... . (1972, p. 8) proposed three regional series, the Comley, St David’s and Merioneth series, which corresponded to the Lower, Middle and the lower half of the Upper Cambrian as then used in Britain, and those authors accepted the long-recognized Tremadoc Series as the uppermost part of the Cambrian...
FIGURES
Journal Article
Published: 01 April 1981
Journal of the Geological Society (1981) 138 (2): 167–176.
.... Davids–Merioneth ages, ~30 Ma), mid-Ordovician (Llandeilo–Caradoc ages, ~32 Ma) and early Silurian (Llandovery–early Wenlock ages, ~12 Ma). During these times sea levels were high and ocean waters below the zone of surface overturning, poorly aerated and, at times, euxinic; pelagic biotas (graptoloids...
Image
Figure  10 —Details of shell lamination and development of internal pitting...
Published: 01 May 2000
Figure 10 —Details of shell lamination and development of internal pitting in Lingulella davisii. All cut from NMW 96.9G.78, Upper Cambrian, Merioneth Series, Ffestiniog Flags Formation, outcrops in and on south side of Nant-y-Gist-faen gorge, approximately 3.2 km west of Arennig Fawr
Image
Figure  5 —Ornament of shell surface in  Lingulella davisii.  All from Uppe...
Published: 01 May 2000
Figure 5 —Ornament of shell surface in Lingulella davisii. All from Upper Cambrian, Merioneth Series, Ffestiniog Flags Formation, outcrops south of Bryn Celynen wood, approximately 1 km west south west of Penmorfa, near Tremadog, Caernarvonshire, North Wales, British National Grid Reference SH
Journal Article
Published: 01 September 1973
Journal of the Geological Society (1973) 129 (5): 481–503.
.... of Wales. Bromley A. V. Intrusive quartz latites in the Blaenau Ffestiniog area, Merioneth Geol J 1965 4 247 256 Bromley A. V. Acid plutonic igneous activity in the Ordovician of North Wales The Pre-Cambrian and Lower Palaeozoic Rocks of Wales 1969 Cardiff Univ. Wales Press...
Journal Article
Published: 01 July 1971
Quarterly Journal of Engineering Geology and Hydrogeology (1971) 4 (3): 209–220.
... of the Ffestiniog Pumped Storage Scheme, Merioneth, Wales. Q. Jl Engng Geol 2 , 184 – 194 . Binnie, G. M., Gerrard, R. T., Eldridge, J. G., Kirmani, S. S., Davis, C. V., Dickinson, J. C. Gwyther, J. R., Thomas, A. R., Little, A. L., Clark, J. F. F...
Image
Figure  1 —Effects and range of tectonic deformation in specimens of  Lingu...
Published: 01 May 2000
Figure 1 —Effects and range of tectonic deformation in specimens of Lingulella davisii from the type area in Caernarfonshire, North Wales; all from Upper Cambrian, Merioneth Series, Ffestiniog Flags Formation. 1, NMW 27.110.G117, essentially undistorted ventral valve exterior, conforming
Journal Article
Published: 01 May 2000
Journal of Paleontology (2000) 74 (3): 426–438.
...Figure 10 —Details of shell lamination and development of internal pitting in Lingulella davisii. All cut from NMW 96.9G.78, Upper Cambrian, Merioneth Series, Ffestiniog Flags Formation, outcrops in and on south side of Nant-y-Gist-faen gorge, approximately 3.2 km west of Arennig Fawr...
FIGURES | View All (10)
Journal Article
Published: 14 September 2009
Geological Magazine (2010) 147 (2): 171–180.
... in the upper part of the St David's Series and extends up into the basal zone of the Merioneth Series of Cowie, Rushton & Stubblefield ( 1972 ). The Laurentian Marjumian Stage extends from below the base of the Drumian up to the base of the Furongian Series. The divisions will now be reviewed briefly...
Journal Article
Published: 01 August 1990
Journal of the Geological Society (1990) 147 (4): 615–618.
... minéralogique de Bretagne, no. 26 Rasul S. M. Acritarch zonation of the Tremadoc Series of the Shineton Shales, Wrekin, Shropshire, England Palynology 1979 3 53 72 Rhodes F. H. T. Chitinozoa from the Ordovician Nod Glas Formation of Merioneth Nature 1961 192 275 276...
Journal Article
Published: 01 September 1988
Journal of the Geological Society (1988) 145 (5): 759–775.
..., Bala Bromley A. V. Intrusive quartz latites in the Blaenau Ffestiniog area, Merioneth Geological Journal 1965 4 247 56 Campbell S. D. G. Reedman A. J. Howells M. F. Regional variations in cleavage and fold development in North Wales Geological Journal 1985 20 43...
Journal Article
Published: 01 August 1990
Journal of the Geological Society (1990) 147 (4): 611–614.
...) Quarterly Journal of the Geological Society of London 1929 85 651 676 Rushton A. W.A. Bassett M. G. Dean W. T. The biostratigraphy and correlation of the Merioneth-Tremadoc Series boundary in North Wales The Cambrian-Ordovician boundary: sections, fossil distributions...
Journal Article
Published: 01 July 1971
Journal of the Geological Society (1971) 127 (4): 371–375.
.... I933. The geology of the Fairbourne-Llwyngwril district, Merioneth. Q. J l geol. Soc. Lond. 89, x45-I7O. JONES, O. T. I952. The drainage systems of Wales and the adjacent regions. Q. Jl geol. Soc. Lond. x07, 2OI-225. - - x955. The geological evolution of Wales and the adjacent areas. Q. Jl geol. Soc...
Journal Article
Published: 01 June 2012
Geological Magazine (2012) 149 (5): 940–943.
... Formation) of Siberia (lower reaches of the Lena river) . Paleontological Journal 40 , 266 –75. Rushton A. W. A. 1982 . The biostratigraphy and correlation of the Merioneth-Tremadoc Series boundary in North Wales . In The Cambrian-Ordovician Boundary: Sections, Fossils Distributions...
Journal Article
Published: 01 September 2000
Geological Magazine (2000) 137 (5): 485–494.
... that the Merioneth Series (Upper Cambrian)–Tremadoc Series boundary in the eastern Harlech Dome is ‘practically coincident’ with the ‘transitional junction’ between very dark grey mudstones of the Dolgellau Member and somewhat paler grey mudstones with siltstone laminae of the overlying Dol-cyn-afon Member...
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Journal Article
Published: 01 September 1990
Journal of the Geological Society (1990) 147 (5): 885–891.
... James D. M. D. James J. The influence of deep fractures on some areas of Ashgillian-Llandoverian sedimentation in Wales Geological Magazine 1969 106 562 582 Jehu R. M. The geology of the district around Towyn and Abergynolwyn (Merioneth) Quarterly Journal of the Geological...
Journal Article
Published: 01 July 1972
Journal of the Geological Society (1972) 128 (4): 388–393.
... deglaciation subsequent to the deposition of that unit. Elsewhere in Llyn correlatives of upper and lower tills are separated by head. Suggestion of two glacial pulses also occurs in adjacent coastal Merioneth: at and around Llwyngwril a Welsh till is plastered against he coastal slope in a manner indicating...
Journal Article
Published: 01 December 1993
Journal of the Geological Society (1993) 150 (6): 1197–1199.
... of Pretannia. Quartzites and other arenites of Cambrian age occur in southwest Wales and the southeast Welsh Borderland (Malvern Hills), and their former wide extent around the southern Welsh Basin is supported by their recently described presence in the Merioneth Series Ffestiniog Beds of the Llangynog Inlier...