Abstract
Two hundred species of calcareous Nannofossils were identified from the Jaddala Formation from type section (stratotype) northwestern Iraq. The recorded of the calcareous nannofossils assemblages enables the recognition of the following four biozones which are (from older to younger): Tribrachiatus orthostylus Interval Biozone (CP10) (Part) Discoaster lodoensis Interval Biozone (CP11) Discoaster sublodoensis Interval Biozone (CP12) Nannotetrina quadrata interval Range Biozone (CP13). On the basis of biocorrelation with previous works Early to Middle Eocene age was confirmed for the Jaddala Formation at the studied section (near Mosul, Iraq), and the paleoclimate was warm referred as tropical to subtropical at low latitude areas.
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