Abstract
ABSTRACTWe 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.
Highlights
The glacial geomorphology of the south Swedish uplands (SSU; Figure 1) has been studied for over 100 years
The same landforms were later described by Bergdahl (1953) and Johnsson (1956) and mapped at small scale by Persson (1972). These studies revealed a broad zone of hummocks in a band primarily parallel to the former ice front, 20 to 40 km wide in the southern part of the SSU extending across southern Sweden and possibly temporally and geomorphically connected to the Göteborg Moraine (Möller, 1987; Möller & Dowling, 2015)
The overall picture of the mapped glacial lineations displays a radial pattern throughout the area
Summary
The glacial geomorphology of the south Swedish uplands (SSU; Figure 1) has been studied for over 100 years. The SSU is one of these regions, and the production of a national 2-meter resolution elevation model (NH), based on Light Detection and Ranging (LiDAR), has revealed the landscape at an unprecedented level of detail (Lantmäteriet, 2015) This new dataset of the Swedish landscape allows scientists to produce and provide the best geomorphic maps and databases to date. These maps and databases illustrate our natural history in the form of maps to be used in education and for parks and reserves (Soyez, 1971) This map, and the data collected during this work, acts as base data for ongoing research focused primarily on the hummock tracts of this region and their implication for glacial dynamics of the Fennoscandian Ice Sheet. The individual hill or knob is called a ‘hummock’ and a region characterized by many of these is called a ‘hummock tract’ In that sense, the term is intended to be parallel to terms like ‘dune field’ and ‘drumlin swarm’
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