Iceberg scours, iceberg gravity craters and current erosion marks from a gigantic Preboreal flood in southeastern Norway

At approximately 9200 BP the Romerike area of southeastern Norway was flooded as much as c. 35 m by a jøkulhlaup from the ice‐dammed lake ‘Nedre Gl'amsjø’. The flood formed characteristic erosion patterns in the surface of soft sediments and eroded channels in overflow passes. Icebergs driven by the floodwater scoured the bottom and formed imprints on the flooded surface when they were stranded as the waterlevel fell. Information from the eroison features is used to reconstruct the palaeocurrents.