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Glacial geomorphology of the south Swedish uplands – focus on the spatial distribution of hummock tracts

Journal article
Authors Gustaf Peterson
Mark D. Johnson
Colby Smith
Published in Journal of Maps
Volume 13
Issue 2
Pages 534-544
ISSN 1744-5647
Publication year 2017
Published at Department of Earth Sciences
Pages 534-544
Language en
Links https://doi.org/10.1080/17445647.20...
Keywords Glacial geomorphology, hummocks, southern Sweden, deglaciation, paleo-glaciology
Subject categories Climate Research, Quaternary geology

Abstract

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.

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