Graptolite biozone correlation charts

David Loydell

    Research output: Contribution to journalArticlepeer-review


    Charts are presented showing the correlation of graptolite biozonations for the Lower Ordovician to Lower Devonian, i.e. for the entire stratigraphical range of the planktonic graptoloid graptolites. Regions chosen are those for which the most detailed biostratigraphical studies have been undertaken. For Baltica, average graptolite zone (chron) duration appears to vary from c. 300000 years (Ludlow Epoch) to 2.4 Ma (Lochkovian Epoch).
    Original languageEnglish
    Pages (from-to)124-132
    Number of pages9
    JournalGeological Magazine
    Issue number1
    Publication statusPublished - 2012


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