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26 results

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  • How old is the Ordovician–Silurian boundary at Dob’s Linn, Scotland? Integrating LA-ICP-MS and CA-ID-TIMS U-Pb zircon dates

  • Hector K. Garza, Elizabeth J. Catlos, Kevin R. Chamberlain, Stephanie E. Suarez, Michael E. Brookfield, Daniel F. Stockli, Richard A. Batchelor
  • Journal:
    Geological Magazine / Volume 160 / Issue 9 / September 2023
    Published online by Cambridge University Press:
    22 November 2023, pp. 1775-1789
    • Article
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  • Sedimentary rocks exposed at Dob’s Linn, Scotland, have significantly influenced our understanding of how life evolved over the Ordovician to Early Silurian. The current interpreted chronostratigraphic boundary between the Ordovician and Silurian periods is a Global Boundary Stratotype Section and Point (GSSP), calibrated to 443.8 ± 1.5 Ma (Hirnatian–Rhuddanian age), based on biostratigraphic markers, radioisotopic dates and statistical modelling. However, challenges arise due to tectonic disturbances, complex correlation issues and the lack of systematic dating in Ordovician–Silurian stratigraphic sections. Here, hundreds of zircon grains from three metabentonite ash horizons were dated using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). A subset of the grains were re-analyzed using Chemical Abrasion Isotope Dilution Thermal Ionization Mass Spectrometry (CA-ID-TIMS). We present a high-precision CA-ID-TIMS 238U-206Pb weighted mean date of 440.44 ± 0.55/0.56/0.72 Ma (±analytical/with tracer/with U-decay constant) for the Coronagraptus cyphus biozone. However, the study reports younger, and in certain cases, older LA-ICP-MS zircon dates within the Coronagraptus cyphus, Akidograptus ascensus and Dicellograptus anceps zones, suspected as being influenced by Pb loss and LA-ICP-MS matrix mismatch. The study reports concerns about the suitability of Dob’s Linn as a GSSP section and examines various LA-ICP-MS maximum depositional age (MDA) approaches, suggesting the use of the TuffZirc date and the youngest mode weighted mean (YMWM) as suitable MDA calculations consistent with CA-ID-TIMS results.

  • Chapter 15 - Book trade

  • from Part III - Contexts
  • Edited by Jack Lynch, Rutgers University, New Jersey
  • Book:
    Samuel Johnson in Context
    Published online:
    05 June 2012
    Print publication:
    10 November 2011, pp 134-142

  • Summary

    BOOK. n.s. [boc, Sax. supposed from boc, a beech; because they wrote on beechen boards, as liber in Latin, from the rind of a tree.]

    1. A volume in which we read or write.

    See a book of prayer in his hand;

    True ornaments to know a holy man. Shakesp. Richard III.

    Most of Samuel Johnson’s major undertakings – A Dictionary of the English Language, The Plays of William Shakespeare, and The Lives of the Most Eminent English Poets – were commissioned by booksellers. As the son of a bookseller, a professional author, and a keen observer of the book trade, Johnson understood the business of books far better than most of his contemporaries. Accordingly, no student of Johnson should neglect this highly important aspect of his life and times.

    Prices

The Cambridge History of the Book in Britain
  • Volume 5, 1695–1830
  • Edited by Michael F. Suarez, SJ, Michael L. Turner
  • Published online:
    28 September 2010
    Print publication:
    29 October 2009
  • This volume covers the history of printing and publishing from the lapse of government licensing of printed works in 1695 to the development of publishing as a specialist commercial undertaking and the industrialization of book production around 1830. During this period, literacy rose and the world of print became an integral part of everyday life, a phenomenon that had profound effects on politics and commerce, on literature and cultural identity, on education and the dissemination of practical knowledge. Written by a distinguished international team of experts, this study examines print culture from all angles: readers and authors, publishers and booksellers; books, newspapers and periodicals; social places and networks for reading; new genres (children's books, the novel); the growth of specialist markets; and British book exports, especially to the colonies. Interdisciplinary in its perspective, this book will be an important scholarly resource for many years to come.

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