Lidar-Based Detection and Interpretation of Glaciotectonic Features of the Morainic Topography of Finland

Figure 17

In the DEM extract from eastern Finland, Nurmes, nearly mega scale glacial lineations can be seen, big drumlins (DR), by the look of it glaciotectonic hummocky moraine (GT), esker (H), and flutes (FL). There are in eastern Finland in supra-aquatic areas around remarkable eskers and glaciofluvial gorges this kind of small fluting fields with low profile (e.g., 1-2 m high) and cross-flow direction with respect to the main flow direction, towards the esker chains. Instead of drumlins, the formation of all these landforms must be a late phenomenon and partly simultaneous. It seems that flutes were born on the last of these landforms under moving ice at the same time when there was a strong glaciofluvial activity which accelerated locally the ablation rate and enabled the flow of ice towards the esker chain (© National Land Survey).