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Downton Bone Bed

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Petrology of the <b>Downton</b> <b>Bone</b> <b>Bed</b> from a <b>bone</b>-rich horizon: ( a ) plane pol...
Published: 28 October 2015
Fig. 1. Petrology of the Downton Bone Bed from a bone-rich horizon: ( a ) plane polarized light, quartz (Qtz), illite (Ill) and thelodont denticle (De); ( b ) cross-polarized light.
Journal Article
Published: 28 October 2015
Journal of Micropalaeontology (2016) 35 (1): 62-65.
...Fig. 1. Petrology of the Downton Bone Bed from a bone-rich horizon: ( a ) plane polarized light, quartz (Qtz), illite (Ill) and thelodont denticle (De); ( b ) cross-polarized light. ...
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Journal Article
Published: 01 December 1989
Journal of the Geological Society (1989) 146 (6): 897-900.
... Reif W. E. Einsele G. Seilacher A. Muschelkalk/Keuper bone-beds (Middle Triassic, SW-Germany—storm condensation in a regressive cycle Cyclic and Event Stratification 1982 Berlin Springer-Verlag 299 325 Siveter D. J. Owens R. M. Thomas A. T. Silurian Field...
Journal Article
Published: 01 December 1973
Journal of the Geological Society (1973) 129 (6): 582-584.
...: The position of the incoming of the Turinia assemblage agrees well with the boundary chosen by the Geological Survey to denote the Downton-Ditton boundary in the Brown Glee region (Greig et al. 1968). This, as most boundaries in this succession, including the Ludlow bone bed, is a facies boundary. The fauna...
Journal Article
Published: 01 December 1973
Journal of the Geological Society (1973) 129 (6): 557-582.
...; Goniporus/Katoporus in U. Red Downton Group; Acanthodians (thelodonts absent) in Holdgate Sandstones Group and Thelodus parvidens in the Silurian—Lower Red Downton Group. The Thelodus parvidens assemblage occurs above and below the Ludlow Bone Bed, which, on the basis of the thelodonts, does not correspond...
Journal Article
Journal: Clay Minerals
Published: 01 March 2006
Clay Minerals (2006) 41 (1): 433-471.
.... The Downton Group is in places conformable with the underlying marine Silurian and over much of the region the transition is represented by the Ludlow Bone Bed, a condensed sequence of shelly and phosphatic material. The succeeding deposits are of marginal marine facies and pass gradually upwards...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.4
EISBN: 9781862393882
... by the thelodont-rich Ludlow Bone Bed. Through a chain of correlation via eastern Europe, involving microfossil groups such as ostracods, the base of the Downton Group can be shown to lie stratigraphically close to the base of the Monograptus parultimus graptolite Biozone, and therefore close to the base...
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Series: Geological Society, London, Special Reports
Published: 01 January 1992
DOI: 10.1144/SR21.1
EISBN: 9781786202840
... in the inlier, but the Brookend Borehole (Cave & White 1971) yielded 63 m of mudstones of these formations, though the base of the Ludlow Series was not reached. At Tites Point the Ludlow Bone Bed indicates conformable passage into the Přidolí, and on the western side of the inlier there is conformable...
Journal Article
Published: 01 November 2013
Journal of Paleontology (2013) 87 (6): 1041-1059.
... upper Whitcliffe Formation, the Ludlow Bone Bed and Downton Castle Sandstone Formation of the Welsh Borderland and southern Britain ( Vergoossen, 1999a , 2000 ; Turner, 1973 , 2000 ; Märss and Miller, 2004 ). Loydell and Frýda (2011 ) proposed a radical new dating of mid-Ludfordian (Ludlow) rather...
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Journal Article
Published: 01 May 2005
Proceedings of the Yorkshire Geological Society (2005) 55 (3): 173-182.
... Formation, (above the Ludlow Bone Bed), Pfidoli Series, Upper Silurian. Ludford Lane, Ludlow, Shropshire [SO 5116 7413]. Manning & Dunlop 1995 , pl. 1, figs 5, 6. (Cited in error as LL.1117.) Eurypterid indet.      FIGURED LL.11118. Platyschisma Shale Member, Downton Castle Sandstone Formation...
Journal Article
Published: 01 September 2006
Geological Magazine (2006) 143 (5): 723-735.
... Hill golf course, Kington, Herefordshire, (2) Perton, Stoke Edith, Herefordshire and (3) Ludlow, Shropshire, all in the Welsh Borderlands, England (Fig. 1 ) and in two different horizons, the Ludlow Bone Bed Member, Downton Castle Sandstone Formation (Ludlow and Kington) and the overlying Temeside...
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Journal Article
Published: 14 September 2009
Geological Magazine (2010) 147 (2): 171-180.
.... 1866 ) had recognized ‘Passage Beds’, later termed the Downton Series, above the Silurian in the Welsh Borderland and underlying the unequivocally Devonian Old Red Sandstone. For many years, most British stratigraphers took the base of the Devonian at the thin Ludlow Bone Bed, which lies at the very...
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1940
AAPG Bulletin (1940) 24 (2): 282-336.
..., above. Elsewhere in this same region and in west-central England, sandstone deposits (Downton) of Old Red type, lie conformably on marine Upper Silurian beds and are included in the Silurian system. Also, the lower Old Red sandstone, which is not included in the Silurian, rests conformably...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.8
EISBN: 9781862393882
... ). The later Downton Subgroup red mudrocks in the area appear to have been deposited on extensive mudflats with fluvial input from the north and west ( Allen 1985 ). Bone-beds are absent in the Raglan Mudstone Formation, and drifted plant material and articulated vertebrates become increasingly common upwards...
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Book Chapter

Author(s)
David J. Siveter
Series: The Micropalaeontological Society, Special Publications
Published: 01 January 2009
DOI: 10.1144/TMS003.3
EISBN: 9781862396210
... of Straw (1928, 1930, 1933) , who noted the possible biostra-tigraphical potential of Ludlow and ‘Downton’ ostracods, and Harper (1940) , who described species from the Llandovery of Shropshire. Martins-son's exemplary research on Baltic and, occasionally, British faunas (e.g. 1962, 1963, 1964, 1965 a, b...
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Series: Geological Society, London, Special Publications
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.180.01.04
EISBN: 9781862394285
...-basins. The aggregate thickness of the thicker sub-basins fills and the later Lower ORS is c. 9 km in the Strathmore region. The later (Emsian) Lower ORS was characterized by major sand-bed rivers (>10 m deep), sourced from the NE, from a drainage basin interpreted to be developed on thickened...
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Journal Article
Journal: Palynology
Published: 01 January 2009
Palynology (2009) 33 (1): 25-75.
... into stages, lies within Bed 96 of the Pozáry Section, Daleje Valley, Prague, Czech Republic, and is coincident with the appearance of the graptolite Monograptus parultimus ( Bassett, 1985 , p. 90). The base of the Devonian and the Lochkovian Stage is defined at a level immediately below the first...
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Journal Article
Published: 01 November 2000
Journal of the Geological Society (2000) 157 (6): 1137-1148.
... of Juviella juvensis Martinsson and Neobeyrichia regnans Martinsson. Trilete spores occur in the Burgsvik Beds ( Gray et al. 1974). There is little evidence of this event in Britain. It may well be that there is a considerable gap in sedimentation at the level of the Ludlow Bone Bed...
FIGURES
Journal Article
Published: 02 August 2013
Geological Magazine (2014) 151 (3): 472-490.
... (Richardson & McGregor, 1986 ). In the UK, its base is immediately above the Ludlow Bone Bed (Richardson & Lister, 1969 ). The age of its base is thought to correspond to the Ludlow–Pridoli boundary and its top spans the Pridoli–Lochkovian boundary. However, the exact...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP417.8
EISBN: 9781862397125
... called niobium ( Griffith & Morris 2003 ). He also examined marine shells such as oysters, fish bones, fossils from Gibraltar and shark’s teeth, showing that the important constituent of bones and teeth was calcium phosphate rather than calcium carbonate, whereas shells contained little...
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