Such model
was recently refined by cosmogenic isotope dating (Ballantyne et al.,
2006, 2007, 2008) and by remote sensing regional geomorphological
mapping (Greenwood and Clark, 2009a,b). Sedimentological analysis
carried out in the Irish Midlands (van der Meer and Warren, 1997)
on late glacial clays in lacustrine basins shows sedimentation of rhythmites
and clays in an unstable environment and the presence of floating
ice in a glacial lake environment.