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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ftcolumbiauniv:oai:academiccommons.columbia.edu: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://doi.org/10.7916/d8-87pc-9e07 English eng https://doi.org/10.7916/d8-87pc-9e07 Paleogeography Palynology Geology Stratigraphic Vertebrates Fossil Articles 2021 ftcolumbiauniv https://doi.org/10.7916/d8-87pc-9e07 2021-11-06T23:20:56Z 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. Article in Journal/Newspaper East Greenland Greenland Columbia University: Academic Commons Fleming Fjord ENVELOPE(-22.867,-22.867,71.733,71.733) Greenland Jameson Land ENVELOPE(-23.500,-23.500,71.167,71.167) Kap ENVELOPE(23.567,23.567,65.533,65.533) Kap Stewart ENVELOPE(-22.633,-22.633,70.433,70.433) |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
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 |
Article in Journal/Newspaper |
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 |
publishDate |
2021 |
url |
https://doi.org/10.7916/d8-87pc-9e07 |
long_lat |
ENVELOPE(-22.867,-22.867,71.733,71.733) ENVELOPE(-23.500,-23.500,71.167,71.167) ENVELOPE(23.567,23.567,65.533,65.533) ENVELOPE(-22.633,-22.633,70.433,70.433) |
geographic |
Fleming Fjord Greenland Jameson Land Kap Kap Stewart |
geographic_facet |
Fleming Fjord Greenland Jameson Land Kap Kap Stewart |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
https://doi.org/10.7916/d8-87pc-9e07 |
op_doi |
https://doi.org/10.7916/d8-87pc-9e07 |
_version_ |
1766399353802457088 |