Catrain M. auteur aut IRD Lezine A. M. auteur aut IRD Turcq Bruno auteur aut IRD Desjardins Thierry auteur aut IRD Mandeng Yogo Magloire auteur aut IRD Cetin Fethiye auteur aut IRD Achoundong G. auteur aut IRD text journalArticle eng text/pdf born digital access A study of the pollen content and organic matter of a 6 m long core recovered from the gallery forest alongside the tributary of Lake Petpenoun, not far from its mouth (NW Cameroon, 5 degrees 38 ' 29.3 N, 10 degrees 38 ' 43.1E, 1120 m asl) doc-uments the evolution of the << Grassfields region >> over the last millennium. The exceptional rate of accumulation of the sedimentary series, where the last millennium is 5 m thick, allows to differentiate two distinct periods. Be-tween 900 and 1420 CE, the coring site was located under lake water, reflecting the expansion of the lake under humid environmental conditions during the Medieval Climate Anomaly (MCA). The coring site then gradually dried up from 1420 CE onward, during the Little Ice Age (LIA). Then, in 1850 CE, modern conditions were estab-lished. During the LIA, the lake edge moved about 140 m downstream of the coring site due to drying conditions. The date of 1420 CE corresponds to a major event that affected not only local hydrological conditions but also regional vegetation. The collapse of pollen production shows the general degradation of the landscape due to increased drought conditions. specialized Pollen Carbon isotope Last millennium Central Africa Grass fields AFRIQUE CENTRALE CAMEROUN 064 076 082 313 104888 [7 ] 2023 0034-6667 https://www.documentation.ird.fr/hor/fdi:010087713 10.1016/j.revpalbo.2023.104888 0034-6667 [F B010087713] https://www.documentation.ird.fr/hor/fdi:010087713 https://www.documentation.ird.fr/intranet/publi/2023-06/010087713.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2023-06-30 2025-02-24 fdi:010087713 fre