Ystwyth Stage

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Book Chapter

D. Q. Bowen
Series: Geological Society, London, Special Reports
Published: 01 January 1999
DOI: 10.1144/SR23.7
EISBN: 9781786202864
... of stage 7 but others of sub-stage 5e age (Bowen 1994&,c). At Minchin Hole Cave, the Hunts Bay Member includes the Patella beach and ‘Neritoides Beach’ of George (1932) and Sutcliffe et al. (1987) with characteristic D-alle/L-Ile ratios of the Hunts Bay Member ( Bowen et al. 1985 ). (6...
Series: Geological Society, London, Special Publications
Published: 01 January 2004
DOI: 10.1144/GSL.SP.2004.222.01.11
EISBN: 9781862394704
... lamination. Davies & Waters (1995) distinguished four discrete Ystrad Meurig lobes. The three oldest of these are of (a) magnus-leptotheca Zone age (mid Aeronian), (b) early convolutus, (c) late con-volutus, and are not documented to the north of the Ystwyth Fault. A very thin younger interval...
Journal Article
Published: 01 July 1972
Journal of the Geological Society (1972) 128 (4): 337–359.
... are characteristic of the area. A number of thrust faults which strike approximately parallel to the fold axial planes, and the Llyfnant fault which has a dextral movement of 98o m, and a northward ownthrow of I85 m, developed uring the later stages of the Cale- donian compressive deformation. Mineralization has...
Journal Article
Journal: Geology
Published: 19 June 2019
Geology (2019) 47 (9): 807–810.
... of the bar, creating lobes that protrude into the channel, locally increasing curvature and inducing bank erosion upstream of the meander apex. Extensional meanders are rare, reflecting an early stage of meander development. The meander symmetry index, which quantifies the geometric change in meander growth...
FIGURES | View All (4)
Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP281.22
EISBN: 9781862395299
... proposed a much smaller, far less detailed map, at one stage suggesting removing most of the dip arrows that Nancy considered crucial for understanding her argument. Eventually she managed to persuade them that her map had to be in its original form, but then she was confronted with demands for drastic...
FIGURES | View All (4)
Journal Article
Published: 09 September 2009
Geological Magazine (2009) 146 (6): 785–850.
... rhabdosomes that have a markedly different appearance from juvenile ones (Williams & Stevens, 1988 , p. 49). Later Ordovician diplograptid taxa are often difficult to classify because the phylogenetically significant patterns of the very earliest growth stages (e.g. Mitchell, 1987 ) can be recognized...
Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.6
EISBN: 9781862393882
... deformation. Divergent views for the timing of these collisions, ranging from mid-Ordovician to Early Devonian, have arisen because of differing emphasis placed on the various lines of evidence – palaeomagnetic, faunal, mag- matic, stratigraphic and tectonic – which relate to different stages of the closure...
FIGURES | View All (18)
Series: Mineralogical Society Series
Published: 01 January 2000
DOI: 10.1180/MSS.9.12
EISBN: 9780903056410
... in the river system. Evans and Davies (1994) , for example, investigated the chemical partitioning of Pb and Zn in contaminated stream sediments from the River Ystwyth in mid-Wales, UK, and showed that confinement of the channel by bedrock created very turbulent flow conditions which favoured...
FIGURES | View All (4)
Journal Article
Published: 01 April 2009
Mineralogical Magazine (2009) 73 (2): 235–250.
..., cerussite, anglesite, hemimorphite, sussannite, bechererite and caledonite. It is late in the paragenesis, forming after caledonite and bechererite by late-stage oxidation of galena. Individual crystals are fibrous to acicular, are elongated along [010], and bounded by ( h 0 l ) faces too small to index...
FIGURES | View All (10)
Journal Article
Journal: Economic Geology
Published: 01 May 2003
Economic Geology (2003) 98 (3): 671–682.
... Late-stage crystallization history of the Jurassic North Mountain basalt, Nova Scotia, Canada, I. Textural and chemical evidence for pervasive development of silicate-liquid immiscibility —Daniel J. Kontak, Michelle Y. DeWolfe, D.E. Young, and Jaroslav Dostal 1287 Mineralogical and geochemical...
Series: Geological Society, London, Engineering Geology Special Publications
Published: 01 January 2001
DOI: 10.1144/GSL.ENG.2001.017.01.02
EISBN: 9781862393790
FIGURES | View All (24)