Drumlinlandschaft auf der Wasserscheide zwischen Pieksämäki und Haukivuori in Mittelfinnland

Abstract

A stereoscopic examination of 36 vertical air photographs at the scale 1 : 60 000, in conjunction with the new topographic maps with contour lines at the 1 : 10 000 covering about 2 450 km2 of Central Finland near Pieksämäki, has been carried out glacialmorphologically. The presence of a large field of several thousand glacial drumlins, of which about 1 050 were linear parallel drumlins of the type »elongated ridges», was revealed and recorded. Some drumlin areas with narrow ridges between Haukivuori, Juva and Joroinen resemble the fluted moraine surface. The results of this study are shown in figure 1. In Central Finland the drumlins, 0.2–7 km in length, 0.05–1.5 km in width, 5–70 m in height, and with a width to length ratio of about 1:4–1:8, are very common and prominent in the landscape. They have been formed at high pressure both under the last inland glaciation and under the front of thinned ice during the movement of the last ice lobe which occupied the area. According to the investigations, both erosion (shaping) and accumulation of existing deposits occur.