Glacial geomorphology of the south Swedish uplands – focus on the spatial distribution of hummock tracts
We present the first comprehensive glacial-landform map of the south Swedish uplands (SSU), deglaciated 15–13 ka ago, using one consistent method and dataset; a Light Detection and Ranging-derived digital elevation model. In particular, this map focuses on the spatial distribution of hummock tracts....
| Main Authors: | , , |
|---|---|
| Format: | Text |
| Language: | unknown |
| Published: |
Taylor & Francis
2017
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.6084/m9.figshare.5132689.v1 https://figshare.com/articles/Glacial_geomorphology_of_the_south_Swedish_uplands_focus_on_the_spatial_distribution_of_hummock_tracts/5132689/1 |
| Summary: | We present the first comprehensive glacial-landform map of the south Swedish uplands (SSU), deglaciated 15–13 ka ago, using one consistent method and dataset; a Light Detection and Ranging-derived digital elevation model. In particular, this map focuses on the spatial distribution of hummock tracts. The distribution of hummock tracts reinforces previous thinking of a broad lobate east–west zone of hummocks across the southern part of the SSU. But this map also reveals a pattern of hummock tracts confined in what we call hummock corridors that have a radial pattern sub-parallel to the overall ice-flow direction. Hummocks occur in a wide variety of morphologies, but we also show the distribution of two distinct forms: V-shaped hummocks and ‘ribbed moraine’. Cross-cutting relationships between hummocks and glacial lineations indicate a more complex chronology than previously suggested. In places, lineations are overlain by hummocks and in other places hummocks are overlain by lineations. Additionally, directional variation of glacial lineations together with a complex end-moraine pattern suggests a dynamic ice sheet with multiple small lobes. Finally, mapped end moraines help to better correlate the deglacial timescales of western and eastern Sweden. |
|---|