The interpretative significance of ripple-derived sedimentary structures within an upper Neogene fluvial succession of central Poland
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Date
2019-04
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Wydawnictwo Naukowe UAM
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Abstract
Sedimentary structures discussed in the present study are genetically linked to ripples that consist of pure sand or al-
ternating sand and mud layers. All types of ripple-related structures, such as climbing-ripple cross-lamination and het-
erolithic bedding, i.e., flaser, wavy and lenticular (nodular), have been identified for the first time in fluvial strata that
have been characterised previously as commonly massive. These small-scale bedforms, produced by migrating ripples,
have been documented in a fluvial channel of late Neogene age in central Poland. The abundance and co-occurrence
of the structures discussed and their spatial distribution provide evidence of their formation under very low-energy
conditions, when flow velocity changed markedly, but was often significantly less than 0.5 m/s. Therefore, these rip-
ple-derived sedimentary structures are here recognised as typical of channel fills of an anastomosing river.
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Keywords
sedimentology, depositional structures, ripples, anastomosing river
Citation
Geologos, 2019, 25, 1, 1-13.
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ISBN
978-83-232187-4-6
ISSN
1426-8981