Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3.
We examine pollen, macrofossils and sedimentological proxies from the Ridge Site, an 18‐m sequence of glacial and non‐glacial sediments exposed along the bank of the Ridge River in the southern Hudson Bay Lowlands (HBL), Canada. As the HBL is located in the previously glaciated region of North Ameri...
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John Wiley
2017
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Online Access: | http://dro.dur.ac.uk/25894/ http://dro.dur.ac.uk/25894/1/25894.pdf https://doi.org/10.1111/bor.12218 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:25894 2023-05-15T16:22:26+02:00 Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. Dalton, April S. Väliranta, Minna Barnett, Peter J. Finkelstein, Sarah A. 2017-07-01 application/pdf http://dro.dur.ac.uk/25894/ http://dro.dur.ac.uk/25894/1/25894.pdf https://doi.org/10.1111/bor.12218 unknown John Wiley dro:25894 issn:0300-9483 issn: 1502-3885 doi:10.1111/bor.12218 http://dro.dur.ac.uk/25894/ https://doi.org/10.1111/bor.12218 http://dro.dur.ac.uk/25894/1/25894.pdf This is the accepted version of the following article: Dalton, April S., Väliranta, Minna, Barnett, Peter J. & Finkelstein, Sarah A. (2017). Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada: evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. Boreas 46(3): 388-401, which has been published in final form at https://doi.org/10.1111/bor.12218. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving. Boreas, 2017, Vol.46(3), pp.388-401 [Peer Reviewed Journal] Article PeerReviewed 2017 ftunivdurham https://doi.org/10.1111/bor.12218 2020-06-04T22:24:55Z We examine pollen, macrofossils and sedimentological proxies from the Ridge Site, an 18‐m sequence of glacial and non‐glacial sediments exposed along the bank of the Ridge River in the southern Hudson Bay Lowlands (HBL), Canada. As the HBL is located in the previously glaciated region of North America, palaeorecords from this region have important implications for understanding ice‐sheet palaeogeography and climate for the late Pleistocene. Two diamicton units were interpreted as subglacial till deposited by a glacier flowing toward the south‐southwest (lower diamicton) and west‐southwest (upper diamicton), respectively. Confined between these tills is a 6‐m non‐glacial unit, constrained to Marine Isotope Stage 3 (MIS 3; c. 57 000 to c. 29 000 a BP) by three radiocarbon dates. Quantitative analyses of the pollen record (dominated by Sphagnum, Cyperaceae, Pinus, Picea, Salix, Alnus and Betula) suggest that average summer temperature (June, July, August) was 14.6±1.51 °C, which is similar to that of the present day at the site. Total annual precipitation was 527±170 mm as compared to 705 mm present‐day. The macrofossil record confirmed the local presence of Betula, Salix and conifers. Our results, in combination with other records from the periphery of the Laurentide Ice Sheet, suggest that vast boreal forest‐type vegetation, along with a drier interstadial climate, existed in the region during MIS 3. We also compare pollen‐derived palaeoclimate reconstructions from the Ridge Site with reconstructions from a previously published site along the Nottaway River, HBL, which was dated to MIS 5a–d (c. 109 000 to c. 82 000 a BP). This comparison suggests that, with additional data, it may be possible to differentiate MIS 3 and MIS 5 deposits in the HBL on the basis of relative continentality, with MIS 3 characterized by lower total annual precipitation, and MIS 5 by values similar or greater than present‐day. Article in Journal/Newspaper glacier* Hudson Bay Ice Sheet Durham University: Durham Research Online Canada Hudson Hudson Bay Boreas 46 3 388 401 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
We examine pollen, macrofossils and sedimentological proxies from the Ridge Site, an 18‐m sequence of glacial and non‐glacial sediments exposed along the bank of the Ridge River in the southern Hudson Bay Lowlands (HBL), Canada. As the HBL is located in the previously glaciated region of North America, palaeorecords from this region have important implications for understanding ice‐sheet palaeogeography and climate for the late Pleistocene. Two diamicton units were interpreted as subglacial till deposited by a glacier flowing toward the south‐southwest (lower diamicton) and west‐southwest (upper diamicton), respectively. Confined between these tills is a 6‐m non‐glacial unit, constrained to Marine Isotope Stage 3 (MIS 3; c. 57 000 to c. 29 000 a BP) by three radiocarbon dates. Quantitative analyses of the pollen record (dominated by Sphagnum, Cyperaceae, Pinus, Picea, Salix, Alnus and Betula) suggest that average summer temperature (June, July, August) was 14.6±1.51 °C, which is similar to that of the present day at the site. Total annual precipitation was 527±170 mm as compared to 705 mm present‐day. The macrofossil record confirmed the local presence of Betula, Salix and conifers. Our results, in combination with other records from the periphery of the Laurentide Ice Sheet, suggest that vast boreal forest‐type vegetation, along with a drier interstadial climate, existed in the region during MIS 3. We also compare pollen‐derived palaeoclimate reconstructions from the Ridge Site with reconstructions from a previously published site along the Nottaway River, HBL, which was dated to MIS 5a–d (c. 109 000 to c. 82 000 a BP). This comparison suggests that, with additional data, it may be possible to differentiate MIS 3 and MIS 5 deposits in the HBL on the basis of relative continentality, with MIS 3 characterized by lower total annual precipitation, and MIS 5 by values similar or greater than present‐day. |
format |
Article in Journal/Newspaper |
author |
Dalton, April S. Väliranta, Minna Barnett, Peter J. Finkelstein, Sarah A. |
spellingShingle |
Dalton, April S. Väliranta, Minna Barnett, Peter J. Finkelstein, Sarah A. Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. |
author_facet |
Dalton, April S. Väliranta, Minna Barnett, Peter J. Finkelstein, Sarah A. |
author_sort |
Dalton, April S. |
title |
Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. |
title_short |
Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. |
title_full |
Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. |
title_fullStr |
Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. |
title_full_unstemmed |
Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada : evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. |
title_sort |
pollen and macrofossil-inferred palaeoclimate at the ridge site, hudson bay lowlands, canada : evidence for a dry climate and significant recession of the laurentide ice sheet during marine isotope stage 3. |
publisher |
John Wiley |
publishDate |
2017 |
url |
http://dro.dur.ac.uk/25894/ http://dro.dur.ac.uk/25894/1/25894.pdf https://doi.org/10.1111/bor.12218 |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
glacier* Hudson Bay Ice Sheet |
genre_facet |
glacier* Hudson Bay Ice Sheet |
op_source |
Boreas, 2017, Vol.46(3), pp.388-401 [Peer Reviewed Journal] |
op_relation |
dro:25894 issn:0300-9483 issn: 1502-3885 doi:10.1111/bor.12218 http://dro.dur.ac.uk/25894/ https://doi.org/10.1111/bor.12218 http://dro.dur.ac.uk/25894/1/25894.pdf |
op_rights |
This is the accepted version of the following article: Dalton, April S., Väliranta, Minna, Barnett, Peter J. & Finkelstein, Sarah A. (2017). Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada: evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3. Boreas 46(3): 388-401, which has been published in final form at https://doi.org/10.1111/bor.12218. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving. |
op_doi |
https://doi.org/10.1111/bor.12218 |
container_title |
Boreas |
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46 |
container_issue |
3 |
container_start_page |
388 |
op_container_end_page |
401 |
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1766010408997486592 |