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Temps zero
Journal Prestige (SJR): 0.101
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1913-5963
Published by Temps zero Homepage  [1 journal]
  • The debate concerning the origin of the Whin Sill of NE England during the
           early and mid-nineteenth century

    • Authors: Holliday D. W.
      Pages: pygs2021-0 - pygs2021-0
      Abstract: The term sill nowadays employed for a broadly concordant igneous intrusion is widely believed to have been derived from the local term for persistent hard beds in the Carboniferous sequence of NE England, in particular the Whin Sill. Despite the intrusive origin of the Whin having been demonstrated in Teesdale by Adam Sedgwick in 1827, for much of the nineteenth century the alternative extrusive hypothesis, of which John Phillips (1836) was the principal proponent, was widely favoured. There were three principal reasons why the intrusive origin was not more widely held, unquestioning acceptance of the erroneous belief of local miners that the Whin Sill was always at the same stratigraphical horizon, a perception that the Teesdale outcrops were not necessarily typical of the rest of the region and a reluctance to accept that the intrusion of such large volumes of magma over such a great area was physically possible. In the 1870s, first the work of Tate and then the detailed six-inch to one-mile mapping of the Geological Survey finally dispelled any notion that the sill was at a consistent stratigraphical level. Curiously, though the correct determination of the intrusive origin of the Whin Sill was one of Sedgwick's earliest and greatest achievements in Northern England, it was not deemed of sufficient importance to merit mention by his biographers.
      PubDate: 2022-01-06T06:18:10-08:00
      DOI: 10.1144/pygs2021-007
      Issue No: Vol. 64, No. 1 (2022)
  • Yorkshire Geological Society Registered Charity No. 220014 Society
           Proceedings 2020

    • Pages: pygs2021-0 - pygs2021-0
      PubDate: 2021-12-20T03:07:25-08:00
      DOI: 10.1144/pygs2021-017
      Issue No: Vol. 64, No. 1 (2021)
  • Iain Cumming Burgess (1934-2021)

    • Pages: pygs2021-0 - pygs2021-0
      PubDate: 2021-12-13T06:39:11-08:00
      DOI: 10.1144/pygs2021-016
      Issue No: Vol. 64, No. 1 (2021)
  • A bored cup of the Mississippian crinoid Synbathocrinus Phillips

    • Authors: Donovan, S. K; Tenny, A.
      Pages: pygs2021-0 - pygs2021-0
      Abstract: Only the second bored cup of the disparid crinoid Synbathocrinus conicus Phillips is described, infested by a pit of Oichnus paraboloides Bromley. Both bored specimens are from the Mississippian of Salthill Quarry, Clitheroe, Lancashire, UK, although the search for others has extended from northern Europe to North America. The first, described 30 years ago, infested a plate triple-junction of the cup on the presumed up-current side of the crinoid; the new specimen, in contrast, is in the centre of a radial plate, which is inflated as a growth response to infestation. We informally name the producing organism the ‘Salthill bug’. Although unknown, this was a small, unmineralized invertebrate that commonly attached to elevated positions on living crinoids and was likely a filter feeder. It constructed a domicile by boring into the crinoid endoskeleton, and could invade both living and dead crinoid skeletons. On crinoid stems it was commonly gregarious, a habit perhaps favoured by secretions by the first ‘Salthill bug’ to settle, attracting conspecific larvae and similar to the settling patterns of some modern sessile invertebrates. Comparison with Oichnus from Trearne Quarry, Ayrshire, UK, reveals several differences between the pits in infested crinoids at the two sites.
      PubDate: 2021-12-06T05:47:00-08:00
      DOI: 10.1144/pygs2021-006
      Issue No: Vol. 64, No. 1 (2021)
  • The Market Weighton High in the 21st century - new understanding of a
           long-standing problem

    • Authors: Wright J. K.
      Pages: pygs2021-0 - pygs2021-0
      Abstract: The sequence of Jurassic and Cretaceous strata laid down in north Lincolnshire is traced northwards onto the Market Weighton High, and compared with the equivalent Cleveland Basin sequence as it is traced south onto the High. Understanding of the manner of operation of the High has long been hindered by the amount of erosion of strata over it, particularly in the Early Cretaceous. Facies analysis of the remaining strata present on either side of the High is used to estimate the thickness and the facies of strata originally deposited over it. Although there were periodic uplifts of the High, leading to increasing omissions of strata approaching it, there is little evidence that during the Jurassic the High was emergent for significant periods. Most strata were either originally present at Market Weighton in marginal marine facies, or continued across the High without interruption. The operation of the High in the light of modern understanding of crustal stresses during the Mesozoic is reviewed.
      PubDate: 2021-12-06T05:47:00-08:00
      DOI: 10.1144/pygs2021-008
      Issue No: Vol. 64, No. 1 (2021)
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Heriot-Watt University
Edinburgh, EH14 4AS, UK
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