Various records of the Grim 1 (127 ka) tephra (Grímsvötn volcano) in the Rangá formation. A) Rangá formation in southern Iceland, topped by the lower tidal sedimentation and seismites (100 m asl); B) Kvíar A site: the Grim 1 tephra at the base of the section, overlapped by glacio fluvial sedimentation deformed by seismic load casts. C) Kvíar A lacustrine basal sedimentation on lodgement tills with a welll individualised dark layer of Grim 1 tephra. D) Preservation at Vesturðalur East of Grim 1 tephra in between the condensed Kvíar rhyolithics series.