Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway.
ABSTRACT A Late Precambrian fluvial sandstone sequence in northern Norway is dominated by large‐scale cross‐sets that show either lenticular or tabular geometries in the streamwise sections. The lenticular sets interdigitate and in places show nearly symmetrical formsets. The tabular sets are in pla...
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Wiley
1987
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crwiley:10.1111/j.1365-3091.1987.tb00562.x 2024-06-02T08:12:05+00:00 Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. RØE, SIGNE‐LINE 1987 http://dx.doi.org/10.1111/j.1365-3091.1987.tb00562.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1987.tb00562.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1987.tb00562.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 34, issue 1, page 89-101 ISSN 0037-0746 1365-3091 journal-article 1987 crwiley https://doi.org/10.1111/j.1365-3091.1987.tb00562.x 2024-05-06T07:05:08Z ABSTRACT A Late Precambrian fluvial sandstone sequence in northern Norway is dominated by large‐scale cross‐sets that show either lenticular or tabular geometries in the streamwise sections. The lenticular sets interdigitate and in places show nearly symmetrical formsets. The tabular sets are in places solitary, but are mainly grouped in cosets. In both cross‐set types, the cross‐strata range from concave‐up to sigmoidal in shape, with the latter variety comprising subhorizontal to gently inclined topset strata (with parting lineation) that merge uninterruptedly downflow into the steeper (10–2°) foresets. Within the cross‐sets the geometry and dip azimuths of the foresets are conspicuously consistent, although the concave‐up and sigmoidal strata commonly alternate downcurrent. The cross‐strata characteristics suggest flood stage deposition from relatively high velocity steady currents heavily laden with suspended sand. Both cross‐set types are interpreted as representing bedforms generated by flow in the dune to upper‐stage plane‐bed transition. The lenticular cross‐sets probably represent periodic dunes, but it is far less clear whether the long bedforms represented by the tabular sets should be classified as dunes, or rather as solitary to quasi‐periodic bars. Article in Journal/Newspaper Northern Norway Wiley Online Library Norway Strata Range ENVELOPE(-129.087,-129.087,56.400,56.400) Sedimentology 34 1 89 101 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT A Late Precambrian fluvial sandstone sequence in northern Norway is dominated by large‐scale cross‐sets that show either lenticular or tabular geometries in the streamwise sections. The lenticular sets interdigitate and in places show nearly symmetrical formsets. The tabular sets are in places solitary, but are mainly grouped in cosets. In both cross‐set types, the cross‐strata range from concave‐up to sigmoidal in shape, with the latter variety comprising subhorizontal to gently inclined topset strata (with parting lineation) that merge uninterruptedly downflow into the steeper (10–2°) foresets. Within the cross‐sets the geometry and dip azimuths of the foresets are conspicuously consistent, although the concave‐up and sigmoidal strata commonly alternate downcurrent. The cross‐strata characteristics suggest flood stage deposition from relatively high velocity steady currents heavily laden with suspended sand. Both cross‐set types are interpreted as representing bedforms generated by flow in the dune to upper‐stage plane‐bed transition. The lenticular cross‐sets probably represent periodic dunes, but it is far less clear whether the long bedforms represented by the tabular sets should be classified as dunes, or rather as solitary to quasi‐periodic bars. |
format |
Article in Journal/Newspaper |
author |
RØE, SIGNE‐LINE |
spellingShingle |
RØE, SIGNE‐LINE Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. |
author_facet |
RØE, SIGNE‐LINE |
author_sort |
RØE, SIGNE‐LINE |
title |
Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. |
title_short |
Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. |
title_full |
Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. |
title_fullStr |
Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. |
title_full_unstemmed |
Cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a Late Precambrian fluvial sandstone, northern Norway. |
title_sort |
cross‐strata and bedforms of probable transitional dune to upper‐stage plane‐bed origin from a late precambrian fluvial sandstone, northern norway. |
publisher |
Wiley |
publishDate |
1987 |
url |
http://dx.doi.org/10.1111/j.1365-3091.1987.tb00562.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1987.tb00562.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1987.tb00562.x |
long_lat |
ENVELOPE(-129.087,-129.087,56.400,56.400) |
geographic |
Norway Strata Range |
geographic_facet |
Norway Strata Range |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Sedimentology volume 34, issue 1, page 89-101 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-3091.1987.tb00562.x |
container_title |
Sedimentology |
container_volume |
34 |
container_issue |
1 |
container_start_page |
89 |
op_container_end_page |
101 |
_version_ |
1800758408896315392 |