Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra
Application of the glass fission-track dating method to Chester Bluff tephra (CBt), exposed in loess deposits at Chester Bluff along the Yukon River in east-central Alaska, has clarified the age of the immediately underlying fossiliferous interglacial bed. Surprise Creek tephra (SZt), at site CRH47...
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Online Access: | http://hdl.handle.net/11585/802314 https://doi.org/10.1017/qua.2017.30 |
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ftunibolognairis:oai:cris.unibo.it:11585/802314 2024-02-11T10:07:38+01:00 Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra Westgate J. A. Pearce N. J. G. Westgate J.A. Pearce N.J.G. 2017 STAMPA http://hdl.handle.net/11585/802314 https://doi.org/10.1017/qua.2017.30 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000405634900012 volume:88 issue:1 firstpage:152 lastpage:159 numberofpages:8 journal:QUATERNARY RESEARCH http://hdl.handle.net/11585/802314 doi:10.1017/qua.2017.30 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85029509267 Beringia Fission track Geochronology Glass shard Paleoenvironment Pleistocene Tephrochronology info:eu-repo/semantics/article 2017 ftunibolognairis https://doi.org/10.1017/qua.2017.30 2024-01-24T17:58:39Z Application of the glass fission-track dating method to Chester Bluff tephra (CBt), exposed in loess deposits at Chester Bluff along the Yukon River in east-central Alaska, has clarified the age of the immediately underlying fossiliferous interglacial bed. Surprise Creek tephra (SZt), at site CRH47 in the northern Old Crow basin of the Yukon Territory, is a correlative of CBt so that the new age information on CBt can also be applied to the interglacial sediments below SZt. Two independent age determinations were obtained on CBt, 243±28 ka and 249±26 ka, giving a weighted mean age and error of 246±19 ka. Therefore, the closely associated interglacial bed belongs to the early part of Marine Oxygen Isotope Stage (MIS) 7. The stratigraphy and paleoenvironmental setting of SZt show that deposition of the tephra occurred soon after interglacial conditions, when the climate became colder, probably between MIS 7.5 and 7.4, that is, slightly younger than the mean fission-track age, but within the 1σ uncertainty. This result tightly constrains the age of the rich mammalian faunal assemblage found at and just below SZt at the CRH47 site. Article in Journal/Newspaper Old Crow Yukon river Alaska Beringia Yukon IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Yukon Quaternary Research 88 1 152 159 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Beringia Fission track Geochronology Glass shard Paleoenvironment Pleistocene Tephrochronology |
spellingShingle |
Beringia Fission track Geochronology Glass shard Paleoenvironment Pleistocene Tephrochronology Westgate J. A. Pearce N. J. G. Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra |
topic_facet |
Beringia Fission track Geochronology Glass shard Paleoenvironment Pleistocene Tephrochronology |
description |
Application of the glass fission-track dating method to Chester Bluff tephra (CBt), exposed in loess deposits at Chester Bluff along the Yukon River in east-central Alaska, has clarified the age of the immediately underlying fossiliferous interglacial bed. Surprise Creek tephra (SZt), at site CRH47 in the northern Old Crow basin of the Yukon Territory, is a correlative of CBt so that the new age information on CBt can also be applied to the interglacial sediments below SZt. Two independent age determinations were obtained on CBt, 243±28 ka and 249±26 ka, giving a weighted mean age and error of 246±19 ka. Therefore, the closely associated interglacial bed belongs to the early part of Marine Oxygen Isotope Stage (MIS) 7. The stratigraphy and paleoenvironmental setting of SZt show that deposition of the tephra occurred soon after interglacial conditions, when the climate became colder, probably between MIS 7.5 and 7.4, that is, slightly younger than the mean fission-track age, but within the 1σ uncertainty. This result tightly constrains the age of the rich mammalian faunal assemblage found at and just below SZt at the CRH47 site. |
author2 |
Westgate J.A. Pearce N.J.G. |
format |
Article in Journal/Newspaper |
author |
Westgate J. A. Pearce N. J. G. |
author_facet |
Westgate J. A. Pearce N. J. G. |
author_sort |
Westgate J. A. |
title |
Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra |
title_short |
Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra |
title_full |
Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra |
title_fullStr |
Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra |
title_full_unstemmed |
Age of some Pleistocene interglacial beds and associated fossils in eastern Beringia defined by fission tracks in glass shards of Chester Bluff tephra |
title_sort |
age of some pleistocene interglacial beds and associated fossils in eastern beringia defined by fission tracks in glass shards of chester bluff tephra |
publishDate |
2017 |
url |
http://hdl.handle.net/11585/802314 https://doi.org/10.1017/qua.2017.30 |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Old Crow Yukon river Alaska Beringia Yukon |
genre_facet |
Old Crow Yukon river Alaska Beringia Yukon |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000405634900012 volume:88 issue:1 firstpage:152 lastpage:159 numberofpages:8 journal:QUATERNARY RESEARCH http://hdl.handle.net/11585/802314 doi:10.1017/qua.2017.30 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85029509267 |
op_doi |
https://doi.org/10.1017/qua.2017.30 |
container_title |
Quaternary Research |
container_volume |
88 |
container_issue |
1 |
container_start_page |
152 |
op_container_end_page |
159 |
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1790606305418805248 |