Problems of moraine morphology: Rogen moraine and Blattnick moraine

In Västerbotten County, Sweden, both Rogen moraine and Blattnick moraine are common in the inner part of the county. Rogen moraines are found primarily in basins and upslope positions, whereas the Blattnick type (first found in the Blattnicksele area in the county) mostly occurs in broader, more plain-like areas. Moreover, both types show a great variety of individual forms, due to topography, basal conditions and ice tectonics. Most Rogen moraine ridges are characterized by features due to active ice. The Blattnick moraine type is characterized by broader and more drumlinized ridges. They are often proximally higher and laterally-distally extended, thus merging into streamlined mounds or hills. The material composition of Rogen and Blattnick moraines is similar. The authors have found the following sequence of transitional forms from the Scandinavian mountains in the west towards the east: (1) Rogen moraines, (2) crescent ridges, (3) Blattnick moraines, (4) drumlins.