Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica
The Lagrelius Point Formation (?Barremian–Aptian) is the basal unit of the Gustav Group and crops out on the north-west coast of James Ross Island. It consists of about 250 m of coarse-grained siliciclastic rocks. The type section of the Lagrelius Point Formation is defined here from just south of L...
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Cambridge University Press (CUP)
1993
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Online Access: | http://dx.doi.org/10.1017/s0954102093000513 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102093000513 |
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crcambridgeupr:10.1017/s0954102093000513 2024-06-23T07:46:24+00:00 Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica Buatois, Luis A. Medina, Francisco J. 1993 http://dx.doi.org/10.1017/s0954102093000513 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102093000513 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 5, issue 4, page 379-388 ISSN 0954-1020 1365-2079 journal-article 1993 crcambridgeupr https://doi.org/10.1017/s0954102093000513 2024-06-12T04:05:01Z The Lagrelius Point Formation (?Barremian–Aptian) is the basal unit of the Gustav Group and crops out on the north-west coast of James Ross Island. It consists of about 250 m of coarse-grained siliciclastic rocks. The type section of the Lagrelius Point Formation is defined here from just south of Lagrelius Point. The measured section comprises the uppermost 80 m of the unit and mainly consists of clast-supported, boulder, cobble to pebble conglomerates; very coarse to medium-grained sandstones occur rarely. Four sedimentary facies are recognized. A disorganized conglomerate facies (1) is interpreted as having been deposited from non-cohesive debris flows and high density gravelly turbidity currents. Inversely graded conglomerate facies (2) and normally graded to graded stratified conglomerate and pebbly sandstone facies (3) reflect sedimentation from high density gravelly turbidity currents. Massive and parallel stratified sandstone facies (4) is thought to record deposition from high density sandy turbidity currents. Two types of facies assemblages have been recognized. A major channel assemblage , represented by the lower part of the measured section and the minor channel assemblage forming the upper part of the section. The total succession is thought to represent the aggradation of a major submarine braided channel followed by the establishment and subsequent infill of a series of minor channels in a marginal terrace. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica James Ross Island Ross Island Cambridge University Press Lagrelius ENVELOPE(-58.297,-58.297,-63.908,-63.908) Lagrelius Point ENVELOPE(-58.300,-58.300,-63.917,-63.917) Ross Island Antarctic Science 5 4 379 388 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The Lagrelius Point Formation (?Barremian–Aptian) is the basal unit of the Gustav Group and crops out on the north-west coast of James Ross Island. It consists of about 250 m of coarse-grained siliciclastic rocks. The type section of the Lagrelius Point Formation is defined here from just south of Lagrelius Point. The measured section comprises the uppermost 80 m of the unit and mainly consists of clast-supported, boulder, cobble to pebble conglomerates; very coarse to medium-grained sandstones occur rarely. Four sedimentary facies are recognized. A disorganized conglomerate facies (1) is interpreted as having been deposited from non-cohesive debris flows and high density gravelly turbidity currents. Inversely graded conglomerate facies (2) and normally graded to graded stratified conglomerate and pebbly sandstone facies (3) reflect sedimentation from high density gravelly turbidity currents. Massive and parallel stratified sandstone facies (4) is thought to record deposition from high density sandy turbidity currents. Two types of facies assemblages have been recognized. A major channel assemblage , represented by the lower part of the measured section and the minor channel assemblage forming the upper part of the section. The total succession is thought to represent the aggradation of a major submarine braided channel followed by the establishment and subsequent infill of a series of minor channels in a marginal terrace. |
format |
Article in Journal/Newspaper |
author |
Buatois, Luis A. Medina, Francisco J. |
spellingShingle |
Buatois, Luis A. Medina, Francisco J. Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica |
author_facet |
Buatois, Luis A. Medina, Francisco J. |
author_sort |
Buatois, Luis A. |
title |
Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica |
title_short |
Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica |
title_full |
Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica |
title_fullStr |
Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica |
title_full_unstemmed |
Stratigraphy and depositional setting of the Lagrelius Point Formation from the Lower Cretaceous of James Ross Island, Antarctica |
title_sort |
stratigraphy and depositional setting of the lagrelius point formation from the lower cretaceous of james ross island, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s0954102093000513 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102093000513 |
long_lat |
ENVELOPE(-58.297,-58.297,-63.908,-63.908) ENVELOPE(-58.300,-58.300,-63.917,-63.917) |
geographic |
Lagrelius Lagrelius Point Ross Island |
geographic_facet |
Lagrelius Lagrelius Point Ross Island |
genre |
Antarc* Antarctic Science Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Science Antarctica James Ross Island Ross Island |
op_source |
Antarctic Science volume 5, issue 4, page 379-388 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102093000513 |
container_title |
Antarctic Science |
container_volume |
5 |
container_issue |
4 |
container_start_page |
379 |
op_container_end_page |
388 |
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1802645697838710784 |