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23The Essaouira-Agadir Basin (EAB) of Morocco contains the most extensive exposure of 24 Aptian to Lower Albian strata onshore the NW African Atlantic Margin. This paper documents the 25 first high-resolution, multi-disciplinary stratigraphic approach for the Aptian to Lower Albian on the 26 NW African Atlantic Margin. Previous biostratigraphic work almost exclusively relied on long-27 distance correlation of ammonoids to the Mediterranean -Caucasian Realm. Recent biostratigraphic 28 work has questioned some of the previous interpretations, highlighting significant faunal endemism 29 and complications with correlation to other key Aptian sections. 30This study focuses on 5 key sections: Tiskatine, Id Amran, Assaka, and DSDP 416/370. 31Distribution of ammonoids, foraminifera, and calcareous nannofossils are reported from a bed-by-32 bed collection made at Tiskatine. 33The analysis of foraminiferal and calcareous nannofossil assemblages enable correlation to 34 standard zonation schemes; but also highlights the urgent need of revision and future work on the 35 integration of these schemes across disciplines. The study, further, includes δ 13 Ccarb, δ 13 Corg, and total 36 organic carbon (TOC) data that is compared to reference material from the Vocontian Basin. 37The combined litho-, bio-, chemo-, and sequence stratigraphic analysis establishes a robust 38 chronostratigraphic framework for regional and super-regional correlations and a type section is 39 proposed for the Aptian of NW Africa at Tiskatine. 40 41

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