The miospore and dinoflagellate cyst oppel‐zonation of the Lias of Portugal

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Abstract
The use of both miospores and dinoflagellate cysts allows fine stratigraphic subdivision of the Lias in Portugal. Seven miospore Oppel‐zones and seven dinoflagellate cyst Oppel‐zones are recognized from the late Sinemurian to Aalenian of the Lusitanian Basin, west‐central Portugal. These have been independently dated by ammonites, foraminifers, and nannofossils. Notes on assemblages from the Bajocian to Oxfordian indicate a similar potential. Liassic assemblages from northwestern Europe demonstrate a similar yet distinctive dinoflagellate succession and a strongly contrasting miospore succession. Comparisons with the Liassic zonation of offshore eastern Canada indicate a strongly correlative succession with slightly discordant ages.