A full‐glacial biota from southeastern Iowa, USA
Abstract Wisconsinan full‐glacial silts filling a swale exposed in Conklin Quarry, Johnson Co., Iowa, contain a large and diverse biota that includes pollen, bryophytes, vascular‐plant macrofossils, small mammals, molluscs, and insects. Radiocarbon dates on wood from the top, middle and bottom of th...
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crwiley:10.1002/jqs.3390010202 2024-06-02T08:15:24+00:00 A full‐glacial biota from southeastern Iowa, USA Baker, Richard G. Rhodes, R. Sanders Schwert, Donald P. Ashworth, Allan C. Frest, Terrence J. Hallberg, George R. Janssens, Jan A. 1986 http://dx.doi.org/10.1002/jqs.3390010202 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390010202 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390010202 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 1, issue 2, page 91-107 ISSN 0267-8179 1099-1417 journal-article 1986 crwiley https://doi.org/10.1002/jqs.3390010202 2024-05-03T10:47:20Z Abstract Wisconsinan full‐glacial silts filling a swale exposed in Conklin Quarry, Johnson Co., Iowa, contain a large and diverse biota that includes pollen, bryophytes, vascular‐plant macrofossils, small mammals, molluscs, and insects. Radiocarbon dates on wood from the top, middle and bottom of the swale fill respectively were 16710 ± 270, 17 170 ± 205, and 18090 ± 190 yr BP. The pollen diagram is dominated by Picea (spruce), Pinus (pine), and Cyperaceae (sedge), and it records low pollen accumulation rates. Plant macrofossils include a number of tundra species along with Picea and Larix (larch) needles and small pieces of wood. The insect fauna contains many species now confined to the forest‐tundra transition zone of northwestern Yukon and Alaska. Small mammals include the tundra indicators Dicrostonyx (collared lemming), and probably Microtus miurus (singing vole) together with boreal forest taxa. The molluscs include extinct and relict species and show the widest range in present geographic distribution, but Rocky Mountain and especially northern elements predominate in the swale fill. All these lines of evidence lead to consistent palaeoclimato‐logical interpretation and palaeoecological reconstruction. The dominant habitats represented by the biota and sedimentary environment collectively included open calcareous silty to sandy or gravelly upland sites, minerotrophic fens (wetlands), pond‐ or stream‐side clayey to sandy shores, and shallow (possibly ephemeral), cold, clear‐water ponds. Mean July temperatures were probably 11° to 13°C cooler than at present. The biota indicates that a Picea‐Larix krummholz with extensive tundra openings was present in southeastern Iowa between 18090 and 16710 yr BP. Article in Journal/Newspaper Tundra Alaska Yukon Wiley Online Library Conklin ENVELOPE(-111.127,-111.127,55.646,55.646) Yukon Journal of Quaternary Science 1 2 91 107 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Wisconsinan full‐glacial silts filling a swale exposed in Conklin Quarry, Johnson Co., Iowa, contain a large and diverse biota that includes pollen, bryophytes, vascular‐plant macrofossils, small mammals, molluscs, and insects. Radiocarbon dates on wood from the top, middle and bottom of the swale fill respectively were 16710 ± 270, 17 170 ± 205, and 18090 ± 190 yr BP. The pollen diagram is dominated by Picea (spruce), Pinus (pine), and Cyperaceae (sedge), and it records low pollen accumulation rates. Plant macrofossils include a number of tundra species along with Picea and Larix (larch) needles and small pieces of wood. The insect fauna contains many species now confined to the forest‐tundra transition zone of northwestern Yukon and Alaska. Small mammals include the tundra indicators Dicrostonyx (collared lemming), and probably Microtus miurus (singing vole) together with boreal forest taxa. The molluscs include extinct and relict species and show the widest range in present geographic distribution, but Rocky Mountain and especially northern elements predominate in the swale fill. All these lines of evidence lead to consistent palaeoclimato‐logical interpretation and palaeoecological reconstruction. The dominant habitats represented by the biota and sedimentary environment collectively included open calcareous silty to sandy or gravelly upland sites, minerotrophic fens (wetlands), pond‐ or stream‐side clayey to sandy shores, and shallow (possibly ephemeral), cold, clear‐water ponds. Mean July temperatures were probably 11° to 13°C cooler than at present. The biota indicates that a Picea‐Larix krummholz with extensive tundra openings was present in southeastern Iowa between 18090 and 16710 yr BP. |
format |
Article in Journal/Newspaper |
author |
Baker, Richard G. Rhodes, R. Sanders Schwert, Donald P. Ashworth, Allan C. Frest, Terrence J. Hallberg, George R. Janssens, Jan A. |
spellingShingle |
Baker, Richard G. Rhodes, R. Sanders Schwert, Donald P. Ashworth, Allan C. Frest, Terrence J. Hallberg, George R. Janssens, Jan A. A full‐glacial biota from southeastern Iowa, USA |
author_facet |
Baker, Richard G. Rhodes, R. Sanders Schwert, Donald P. Ashworth, Allan C. Frest, Terrence J. Hallberg, George R. Janssens, Jan A. |
author_sort |
Baker, Richard G. |
title |
A full‐glacial biota from southeastern Iowa, USA |
title_short |
A full‐glacial biota from southeastern Iowa, USA |
title_full |
A full‐glacial biota from southeastern Iowa, USA |
title_fullStr |
A full‐glacial biota from southeastern Iowa, USA |
title_full_unstemmed |
A full‐glacial biota from southeastern Iowa, USA |
title_sort |
full‐glacial biota from southeastern iowa, usa |
publisher |
Wiley |
publishDate |
1986 |
url |
http://dx.doi.org/10.1002/jqs.3390010202 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390010202 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390010202 |
long_lat |
ENVELOPE(-111.127,-111.127,55.646,55.646) |
geographic |
Conklin Yukon |
geographic_facet |
Conklin Yukon |
genre |
Tundra Alaska Yukon |
genre_facet |
Tundra Alaska Yukon |
op_source |
Journal of Quaternary Science volume 1, issue 2, page 91-107 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3390010202 |
container_title |
Journal of Quaternary Science |
container_volume |
1 |
container_issue |
2 |
container_start_page |
91 |
op_container_end_page |
107 |
_version_ |
1800739563760517120 |