Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard
We describe the invertebrate assemblages in the Middle Jurassic to lowermost Cretaceous of the Agardhfjellet Formation present in the DH2 rock core material of Central Spitsbergen (Svalbard). Previous studies of the Agardhfjellet Formation do not accurately reflect the distribution of invertebrates...
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Geological Society of Norway
2019
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ftleedsuniv:oai:eprints.whiterose.ac.uk:141594 2023-05-15T15:07:39+02:00 Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard Koevoets, MK Hammer, Ø Little, CTS 2019-06-20 text https://eprints.whiterose.ac.uk/141594/ https://eprints.whiterose.ac.uk/141594/8/NJG_Vol99_Nr1_Art_Koevoets.pdf https://njg.geologi.no/vol-91-100/details/1/2202-2202 en eng Geological Society of Norway https://eprints.whiterose.ac.uk/141594/8/NJG_Vol99_Nr1_Art_Koevoets.pdf Koevoets, MK, Hammer, Ø and Little, CTS orcid.org/0000-0002-1917-4460 (2019) Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard. Norwegian Journal of Geology, 99 (1). ISSN 2387-5852 cc_by_4 CC-BY Article NonPeerReviewed 2019 ftleedsuniv 2023-01-30T22:15:23Z We describe the invertebrate assemblages in the Middle Jurassic to lowermost Cretaceous of the Agardhfjellet Formation present in the DH2 rock core material of Central Spitsbergen (Svalbard). Previous studies of the Agardhfjellet Formation do not accurately reflect the distribution of invertebrates throughout the unit as they were limited to sampling discontinuous intervals at outcrop. The rock core material shows the benthic bivalve fauna to reflect dysoxic, but not anoxic environments for the Oxfordian – lower Kimmeridgian interval with sporadic monospecific assemblages of epifaunal bivalves, and more favourable conditions in the Volgian, with major increases in abundance and diversity of Hartwellia sp. assemblages. Overall, the new information from cores show that abundance, diversity and stratigraphic continuity of the fossil record in the Upper Jurassic of Spitsbergen are considerably higher than indicated in outcrop studies. The inferred life positions and feeding habits of the benthic fauna refine the understanding of the depositional environments of the Agardhfjellet Formation. The occurrence pattern of the bivalve genera is correlated with published studies of Arctic localities in East Greenland and Northern Siberia and shows similarities in palaeoecology with the former but not the latter. Ammonite biostratigraphy is used as a tool to date bivalve assemblage overturning events to help identify similar changes in other sections. Article in Journal/Newspaper Arctic East Greenland Greenland Svalbard Siberia Spitsbergen White Rose Research Online (Universities of Leeds, Sheffield & York) Arctic Svalbard Greenland Agardhfjellet ENVELOPE(18.833,18.833,78.083,78.083) |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
We describe the invertebrate assemblages in the Middle Jurassic to lowermost Cretaceous of the Agardhfjellet Formation present in the DH2 rock core material of Central Spitsbergen (Svalbard). Previous studies of the Agardhfjellet Formation do not accurately reflect the distribution of invertebrates throughout the unit as they were limited to sampling discontinuous intervals at outcrop. The rock core material shows the benthic bivalve fauna to reflect dysoxic, but not anoxic environments for the Oxfordian – lower Kimmeridgian interval with sporadic monospecific assemblages of epifaunal bivalves, and more favourable conditions in the Volgian, with major increases in abundance and diversity of Hartwellia sp. assemblages. Overall, the new information from cores show that abundance, diversity and stratigraphic continuity of the fossil record in the Upper Jurassic of Spitsbergen are considerably higher than indicated in outcrop studies. The inferred life positions and feeding habits of the benthic fauna refine the understanding of the depositional environments of the Agardhfjellet Formation. The occurrence pattern of the bivalve genera is correlated with published studies of Arctic localities in East Greenland and Northern Siberia and shows similarities in palaeoecology with the former but not the latter. Ammonite biostratigraphy is used as a tool to date bivalve assemblage overturning events to help identify similar changes in other sections. |
format |
Article in Journal/Newspaper |
author |
Koevoets, MK Hammer, Ø Little, CTS |
spellingShingle |
Koevoets, MK Hammer, Ø Little, CTS Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard |
author_facet |
Koevoets, MK Hammer, Ø Little, CTS |
author_sort |
Koevoets, MK |
title |
Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard |
title_short |
Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard |
title_full |
Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard |
title_fullStr |
Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard |
title_full_unstemmed |
Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard |
title_sort |
palaeoecology and palaeoenvironments of the middle jurassic to lowermost cretaceous agardhfjellet formation (bathonian-ryazanian), spitsbergen, svalbard |
publisher |
Geological Society of Norway |
publishDate |
2019 |
url |
https://eprints.whiterose.ac.uk/141594/ https://eprints.whiterose.ac.uk/141594/8/NJG_Vol99_Nr1_Art_Koevoets.pdf https://njg.geologi.no/vol-91-100/details/1/2202-2202 |
long_lat |
ENVELOPE(18.833,18.833,78.083,78.083) |
geographic |
Arctic Svalbard Greenland Agardhfjellet |
geographic_facet |
Arctic Svalbard Greenland Agardhfjellet |
genre |
Arctic East Greenland Greenland Svalbard Siberia Spitsbergen |
genre_facet |
Arctic East Greenland Greenland Svalbard Siberia Spitsbergen |
op_relation |
https://eprints.whiterose.ac.uk/141594/8/NJG_Vol99_Nr1_Art_Koevoets.pdf Koevoets, MK, Hammer, Ø and Little, CTS orcid.org/0000-0002-1917-4460 (2019) Palaeoecology and palaeoenvironments of the Middle Jurassic to lowermost Cretaceous Agardhfjellet Formation (Bathonian-Ryazanian), Spitsbergen, Svalbard. Norwegian Journal of Geology, 99 (1). ISSN 2387-5852 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
_version_ |
1766339111834091520 |