Abstract
Research Article| September 30, 1931 Ordovician Sections of Great Britain and Their American Equivalents RICHARD M. FIELD RICHARD M. FIELD Search for other works by this author on: GSW Google Scholar GSA Bulletin (1931) 42 (3): 751–758. https://doi.org/10.1130/GSAB-42-751 Article history received: 16 Mar 1931 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation RICHARD M. FIELD; Ordovician Sections of Great Britain and Their American Equivalents. GSA Bulletin 1931;; 42 (3): 751–758. doi: https://doi.org/10.1130/GSAB-42-751 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract History of InvestigationsThe type sections of the Ordovician, as defined by Charles Lapworth, are in Wales and Shropshire. The system was divided by Lapworth into three series: the Arenig, the Llandeilo, and the Bala. These three series are found nearly complete near Shelve in Shropshire. There has been considerable confusion in the use of the terms Llandeilo and Bala, largely owing to attempted correlation with beds of similar age in the Lake District. Professor Sedgwick referred all the formations above the Arenig to the Bala group; but according to Professor Marr the Llandeilo series of Murchison was subsequently used in the sense of the lower Bala of Sedgwick; the middle Bala was regarded as the Caradoc series; and Ash-gillian has been proposed for the upper Bala. It is rather a curious circumstance that the Bala, under the above classification, becomes more nearly the equivalent of Ulrich’s Ordovician, since Ulrich . . . This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.
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