High-resolution Early Holocene palynological records from the middle Meuse River valley were missing until recently. In order
to investigate environmental and inferred climate changes during the Preboreal, sediments from a former residual channel of
the Meuse River near Haelen were studied. Detailed multi-proxy analyses, including microfossils, macroremains and loss-on-ignition
measurements, were carried out at a high temporal resolution. An accurate chronology of the >1000-year-long record was
provided by accelerator mass spectrometry (AMS) 14C wiggle-match dating.
The channel was abandoned during the late
Younger Dryas, when accumulation started with gyttja. This period was characterised by an open landscape with herbaceous vegetation
and dwarf shrubs. Patches of birch were present on the floodplains around depressions and (oxbow) lakes. Some pines survived
the cold in sheltered locations. In the residual channel the water was flowing temporarily and aquatic plant communities developed
with predominantly submerged taxa and algae. The shores were fringed by willows and sedges and were probably used as a watering
place by large herbivores.
Following the Late-glacial/Holocene climate warming, dated in the Haelen record around
11,520 cal BP, birch woodlands expanded on the river floodplains and slopes of terraces during the Friesland Phase. Open vegetation
with herbs and juniper remained present on the nearby terraces. An increase in the water level of the oxbow lake and seepage
of groundwater occurred. Along the shores herbaceous vegetation was present. Around 11,420 cal BP, birch expansion was interrupted
by the dry continental Rammelbeek Phase. On the river floodplain and terrace slopes, open grassland vegetation developed and
on the terraces, grasslands and open grounds were abundant. In the residual channel the water became stagnant and floating-leaved
vegetation developed. At the start of the Late Preboreal, around 11,270 cal BP, a sudden shift to a more humid climate took
place and birch forests expanded again on the river floodplains and terrace slopes. Poplar became more abundant in these forests,
and birch and poplar swamp forests were present near the site. Pine expanded at c. 11,160 cal BP on the higher sandy and gravelly
terraces. During the Late Preboreal a reed swamp developed on the shores of the residual channel.
At the onset of
the Boreal, around 10,710 cal BP, woodlands, initially with hazel, but later also with oak, elm and lime, started to develop,
while pine forest remained present on the higher terraces. Hazel shrubs were growing on the terrace slopes. Birch and poplar
forests occurred on moist parts of the floodplains. Around the residual channel they formed a zone behind the reed swamps
surrounding the oxbow lake. Vegetation with water lilies was present in open water.
The Haelen record shows, despite
a lack of archaeological evidence, indications for the presence of Mesolithic people in the area during the Preboreal. These
include the occurrence of (natural or man-made) fires, in combination with the presence of trampled areas and disturbed grounds
and possibly consumption of Nymphaeaceae seeds and tubers.