Spatial distribution and morphological aspects of eskers and bedrock valleys in north Estonia; implications for the reconstruction of a subglacial drainage system under the late Weichselian Baltic ice stream

Rattas, M.

Special Paper - Geological Survey of Finland 46: 63-68

2007


Accession: 023643114

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Abstract
The spatial distribution of eskers and bedrock valleys, their antecedent role in draining subglacial meltwater and their relationship to bedrock lithology are discussed. Bedrock valleys and eskers are arranged in a sub-parallel pattern reflecting former meltwater flow towards the ice margin. Several esker systems are continued to the valley limits following either the valley floors or lying upon their shoulders. Such spatial relationships suggest that the initial focusing of meltwater may have been controlled by the location of bedrock valleys. Alternatively, some of the buried valleys or segments of valleys may be the result of tunnel valley formation. Some valleys have clear morphological characteristics of a tunnel valley, like abrupt termination and undulating or convex-up longitudinal profiles. Sedimentary records suggest that some valley infill and esker sediments may have been developed as a successive formation.