Kame or moraine? A sedimentological study of a glaciomarginal landform at Niedźwiedziny (Great Polish Lowland)
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Date
2014-09
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Instytut Geologii UAM
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Abstract
A sedimentary succession in a gravel pit at Niedźwiedziny was investigated in order to determine its origin: kame or moraine. The gravel pit is located in an isolated hill of approx. 600 m long and 250–400 m wide.
The succession is built of glaciofluvial deposits: a sandy/gravelly unit in the lower and middle parts, overlain by diamicton. Five lithofacies have been distinguished, which represent two facies associations: (1) a fluvial association evolving
from a high-energy to a transitional to a shallow braided river on an alluvial fan, and (2) an association of cohesive
deposits representing a glacigenic mass flow. The interpretation is based mainly on palaeocurrent data and differs from
conclusions by earlier investigators. The ice-marginal zone is characterised by a large variety of glaciomarginal forms.
Their sedimentology, morphology and palaeogeography are determined by successive phases of deglaciation. The re -sults of the present study show that the character of the deglaciation in the study area changed with time from frontal to areal deglaciation.
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Keywords
sedimentology, glaciomarginal zone, kame, Weichselian, Middle Poland
Citation
Geologos, 2014, 20, 3, s. 167-181
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ISBN
978-83-232187-4-6
ISSN
1426-8981