Eemian to Early Weichselian regional and local vegetation development and sedimentary and geomorphological controls, Amersfoort Basin, The Netherlands

Abstract Two new records from the Amersfoort glacial basin are investigated by means of pollen analysis. The cores situated in deeper part, close to original Eemian stratotype 1 (Zagwijn, 1961) and at margin basin. aim is reconstruct Early Weichselian vegetation development explore impact accommodation space, influx allochthonous geomorphology on composition. results Basin compared current Amsterdam other sites Netherlands. An almost complete sequence (E2-EWII) was retrieved part late Saalian (LS) early transition not recorded basin, contrast Basin. marginal core Den Treek reveals a condensed (E5-6) (EW I-II) succession showing importance space. first transgression registered E3 E4a boundary basins, highest sea level proposed end zone E5. Upstream delta, palaeo-Vecht valley IJssel Basin, later. reworked (allochthonous) clastic sediment units hampers climatic reconstructions during LS Eemian. appearance Picea E4 Abies E5 intervals can be related long-distance transport river Rhine redistribution delta. Local complicate regional biostratigraphic correlations. Alnus , considered characteristic for (E5-6), shows large differences over short distances local alder growth since E3. Carpinus diagnostic E5, high values basins adjacent higher, well-drained ice-pushed ridges, but low low-relief environments. Salt- brackish-water marshes were present while further upstream delta brackish fresh-water tidal conditions dominated. In line with Zagwijn (1961), E6 EWI defined opening cover Calluna Poaceae Artemisia increase, often coinciding lithological change organic deposition, reflecting increased landscape instability. reveal record. It suggested define base Stage Amsterdam-Terminal fully developed contains Stage.