References

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First Author Year Title Link Action
Gutiérrez-Marco, J. C. et al. 1999 A biostratigraphical review of the Middle Ordovician shales from NW S… https://www.zotero.…
Mitchell, C. E. et al. 1998 A diverse Da2 fauna preserved within an altered volcanic ash fall, Ea… https://www.zotero.…
Colmenar, J. et al. 2013 A draboviid brachiopod association from the Upper Ordovician of Portu… https://www.zotero.…
Vai, G. B. 2007 A history of chronostratigraphy https://www.researc…
Blodgett, R. B. et al. 1987 A late Ordovician age reappraisal for the Upper Fossil Creek Volcanic… https://www.zotero.…
Bolton, T. E. & Nowlan, G. S. 1979 A Late Ordovician fossil assemblage from an outlier north of Aberdeen… https://www.zotero.…
Charles Lyell 1855 A manual of elementary geology https://www.biodive…
Mitchell, C. et al. 2008 A mixed isograptid-didymograptid graptolites assemblage from the Midd… https://www.zotero.…
Serpagli, E. et al. 2007 A new early Ordovician Conodont Genus from the Southern Montagne Noir… https://www.zotero.…
Bergström et al. 2012 A new upper Middle Ordovician–Lower Silurian drillcore standard succe… https://www.zotero.…