THE SIHTUUNA MORAINE AT TERVOLA, SOUTHERN LAPLAND

As part of an investigation into the origin of an assemblage of morain ic ridges, the Sihtuuna morainic was studied. It consists of boulder-c overed ridges arranged perpendicular to the last ice-flow direction. T he subsurface parts of the ridges consist of both flow till and contor ted or undisturbed stratified sediments. High Au contents occur close to the surface, at a depth of 0.5-1 m. The data suggest that a subglac ial mass flowage and subsequent quarrying during the later stages of l ocal deglaciation was responsible for the formation of the morainic as semblage.