A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin
The Kap Stewart Group (Rhaetian-Sinemurian, Triassic–Early Jurassic) of the Jameson Land Basin in central East Greenland has traditionally been regarded as a strictly continental unit with delta and perennial lake sediments. New finds of plesiosaur bone remain in a thin storm deposited sandstone bed...
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Columbia University
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ftdatacite:10.7916/d8-87pc-9e07 2023-05-15T16:03:39+02:00 A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin Clemmensen, Lars Lindström, Sofie Mateus, Octávio Mau, Malte Milan, Jesper Kent, Dennis V. 2021 https://dx.doi.org/10.7916/d8-87pc-9e07 https://academiccommons.columbia.edu/doi/10.7916/d8-87pc-9e07 unknown Columbia University https://dx.doi.org/10.1111/let.12449 Paleogeography Palynology Geology, Stratigraphic Vertebrates, Fossil Articles article-journal Text ScholarlyArticle 2021 ftdatacite https://doi.org/10.7916/d8-87pc-9e07 https://doi.org/10.1111/let.12449 2022-02-08T12:23:07Z The Kap Stewart Group (Rhaetian-Sinemurian, Triassic–Early Jurassic) of the Jameson Land Basin in central East Greenland has traditionally been regarded as a strictly continental unit with delta and perennial lake sediments. New finds of plesiosaur bone remain in a thin storm deposited sandstone bed in the middle part of the Rhætelv Formation of the Kap Stewart Group, however, indicates a likely period of marine influence. At the study area at the eastern margin of the basin, the Rhætelv Formation is 300-m thick and overlies unconformably the Norian Fleming Fjord Group. The bone-bearing sandstone occurs 190 m above the base of the group and is closely associated with black laminated mudstones; palynological investigation of three samples from these mudstones indicates that they are of a younger Hettangian age. The Hettangian was a relatively short stage (201.3–199.5 Ma) and elsewhere characterized by two episodes of sea-level highstands. Assuming that the marine incursion in the Jameson land Basin evidenced by the plesiosaur fossil remains took place during the youngest of these sea-level highstands, the bone-bearing bed of the Rhætelv Formation can be dated to 200 Ma and thereby gives the first numerical age constraint of this hitherto poorly dated succession. Text East Greenland Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland Kap ENVELOPE(23.567,23.567,65.533,65.533) Jameson Land ENVELOPE(-23.500,-23.500,71.167,71.167) Fleming Fjord ENVELOPE(-22.867,-22.867,71.733,71.733) Kap Stewart ENVELOPE(-22.633,-22.633,70.433,70.433) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Paleogeography Palynology Geology, Stratigraphic Vertebrates, Fossil |
spellingShingle |
Paleogeography Palynology Geology, Stratigraphic Vertebrates, Fossil Clemmensen, Lars Lindström, Sofie Mateus, Octávio Mau, Malte Milan, Jesper Kent, Dennis V. A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin |
topic_facet |
Paleogeography Palynology Geology, Stratigraphic Vertebrates, Fossil |
description |
The Kap Stewart Group (Rhaetian-Sinemurian, Triassic–Early Jurassic) of the Jameson Land Basin in central East Greenland has traditionally been regarded as a strictly continental unit with delta and perennial lake sediments. New finds of plesiosaur bone remain in a thin storm deposited sandstone bed in the middle part of the Rhætelv Formation of the Kap Stewart Group, however, indicates a likely period of marine influence. At the study area at the eastern margin of the basin, the Rhætelv Formation is 300-m thick and overlies unconformably the Norian Fleming Fjord Group. The bone-bearing sandstone occurs 190 m above the base of the group and is closely associated with black laminated mudstones; palynological investigation of three samples from these mudstones indicates that they are of a younger Hettangian age. The Hettangian was a relatively short stage (201.3–199.5 Ma) and elsewhere characterized by two episodes of sea-level highstands. Assuming that the marine incursion in the Jameson land Basin evidenced by the plesiosaur fossil remains took place during the youngest of these sea-level highstands, the bone-bearing bed of the Rhætelv Formation can be dated to 200 Ma and thereby gives the first numerical age constraint of this hitherto poorly dated succession. |
format |
Text |
author |
Clemmensen, Lars Lindström, Sofie Mateus, Octávio Mau, Malte Milan, Jesper Kent, Dennis V. |
author_facet |
Clemmensen, Lars Lindström, Sofie Mateus, Octávio Mau, Malte Milan, Jesper Kent, Dennis V. |
author_sort |
Clemmensen, Lars |
title |
A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin |
title_short |
A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin |
title_full |
A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin |
title_fullStr |
A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin |
title_full_unstemmed |
A new vertebrate fossil-bearing layer in the Rhætelv Formation (Kap Stewart Group) of central East Greenland: evidence of a Hettangian marine incursion into the continental Jameson Land Basin |
title_sort |
new vertebrate fossil-bearing layer in the rhætelv formation (kap stewart group) of central east greenland: evidence of a hettangian marine incursion into the continental jameson land basin |
publisher |
Columbia University |
publishDate |
2021 |
url |
https://dx.doi.org/10.7916/d8-87pc-9e07 https://academiccommons.columbia.edu/doi/10.7916/d8-87pc-9e07 |
long_lat |
ENVELOPE(23.567,23.567,65.533,65.533) ENVELOPE(-23.500,-23.500,71.167,71.167) ENVELOPE(-22.867,-22.867,71.733,71.733) ENVELOPE(-22.633,-22.633,70.433,70.433) |
geographic |
Greenland Kap Jameson Land Fleming Fjord Kap Stewart |
geographic_facet |
Greenland Kap Jameson Land Fleming Fjord Kap Stewart |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
https://dx.doi.org/10.1111/let.12449 |
op_doi |
https://doi.org/10.7916/d8-87pc-9e07 https://doi.org/10.1111/let.12449 |
_version_ |
1766399351599398912 |