Arid, mosaic environments during the Plio-Pleistocene transition and early hominin dispersals in northern Africa

Résumé

The earliest archaeological evidence from northern Africa dates to ca. 2.44 Ma. Nevertheless, the palaeoenvironmental setting of hominins living in this part of the continent at the Plio-Pleistocene transition remains poorly documented, particularly in comparison to eastern and southern Africa. The Guefaït-4 fossil site in eastern Morocco sheds light on our knowledge of palaeoenvironments in northern Africa. Our study reveals the oldest known presence of C4 plants in the northern part of the continent in a mosaic landscape that includes open grasslands, forested areas, wetlands, and seasonal aridity. This diverse landscape and resource availability likely facilitated the occupation of the region by mammals, including potentially hominins. Our regional-scale study provides a complementary perspective to global-scale studies and highlights the importance of considering the diversity of microhabitats within a given region when studying species-dispersal dynamics. The palaeoenvironmental context for early hominins in northern Africa during the Plio-Pleistocene transition is poorly documented. Here, the authors present multiproxy palaeoecological evidence for heterogeneous open grasslands, forested areas, wetlands, and seasonal aridity from Guefaït-4.2 in Morocco.

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