Journal
GEOLOGICAL MAGAZINE
Volume 149, Issue 1, Pages 124-132Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756811000513
Keywords
graptolite; biostratigraphy; Ordovician; Silurian; Devonian
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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. 300 000 years (Ludlow Epoch) to 2.4 Ma (Lochkovian Epoch).
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