Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska
Abstract Deformation structures interpreted as vertebrate hoof- and foot-tracks occur within upper-Pleistocene eolian sand-sheet deposits in the stabilized Kantishna sand sea of central Alaska and in the Nushagak lowland of southwestern Alaska. Exposures of tracks are generally limited to cross sect...
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Cambridge University Press (CUP)
1996
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crcambridgeupr:10.1006/qres.1996.0023 2024-09-15T18:41:25+00:00 Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska Lea, Peter D. 1996 http://dx.doi.org/10.1006/qres.1996.0023 http://api.elsevier.com/content/article/PII:S003358949690023X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949690023X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940002473X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 45, issue 2, page 226-240 ISSN 0033-5894 1096-0287 journal-article 1996 crcambridgeupr https://doi.org/10.1006/qres.1996.0023 2024-07-31T04:01:29Z Abstract Deformation structures interpreted as vertebrate hoof- and foot-tracks occur within upper-Pleistocene eolian sand-sheet deposits in the stabilized Kantishna sand sea of central Alaska and in the Nushagak lowland of southwestern Alaska. Exposures of tracks are generally limited to cross sections, which reveal concave-up deformation structures in which displacement of preexisting strata diminishes downward. Deposits in both areas contain tracks that are 6 to 16 cm in diameter and are divided by a central ridge, reflecting formation by artiodactyl (even-toed) ungulates. Larger (21–34 cm) tracks without a central ridge, observed in the Nushagak lowland, were formed by proboscideans, probably woolly mammoth. Large vertebrate tracks occur within irregularly stratified sand and silty sand that accumulated upon partially vegetated sand sheets, and within thin, even wind-ripple laminae of unvegetated sand sheets. The presence of tracks at multiple stratigraphic levels and preservation of roots and rhizocretions within the eolian deposits suggest that vegetated sand sheets may have formed a locally important grazing habitat for large herbivores during at least part of the last glaciation. Recognition that vertebrate tracks are preserved in eolian sand-sheet deposits, and in deposits of other environments as well, opens a new source of stratigraphic and paleoecological data to aid reconstruction of the vanished ecosystems of Beringia. Article in Journal/Newspaper Alaska Beringia Cambridge University Press Quaternary Research 45 2 226 240 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Deformation structures interpreted as vertebrate hoof- and foot-tracks occur within upper-Pleistocene eolian sand-sheet deposits in the stabilized Kantishna sand sea of central Alaska and in the Nushagak lowland of southwestern Alaska. Exposures of tracks are generally limited to cross sections, which reveal concave-up deformation structures in which displacement of preexisting strata diminishes downward. Deposits in both areas contain tracks that are 6 to 16 cm in diameter and are divided by a central ridge, reflecting formation by artiodactyl (even-toed) ungulates. Larger (21–34 cm) tracks without a central ridge, observed in the Nushagak lowland, were formed by proboscideans, probably woolly mammoth. Large vertebrate tracks occur within irregularly stratified sand and silty sand that accumulated upon partially vegetated sand sheets, and within thin, even wind-ripple laminae of unvegetated sand sheets. The presence of tracks at multiple stratigraphic levels and preservation of roots and rhizocretions within the eolian deposits suggest that vegetated sand sheets may have formed a locally important grazing habitat for large herbivores during at least part of the last glaciation. Recognition that vertebrate tracks are preserved in eolian sand-sheet deposits, and in deposits of other environments as well, opens a new source of stratigraphic and paleoecological data to aid reconstruction of the vanished ecosystems of Beringia. |
format |
Article in Journal/Newspaper |
author |
Lea, Peter D. |
spellingShingle |
Lea, Peter D. Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska |
author_facet |
Lea, Peter D. |
author_sort |
Lea, Peter D. |
title |
Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska |
title_short |
Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska |
title_full |
Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska |
title_fullStr |
Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska |
title_full_unstemmed |
Vertebrate Tracks in Pleistocene Eolian Sand-Sheet Deposits of Alaska |
title_sort |
vertebrate tracks in pleistocene eolian sand-sheet deposits of alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1006/qres.1996.0023 http://api.elsevier.com/content/article/PII:S003358949690023X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949690023X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940002473X |
genre |
Alaska Beringia |
genre_facet |
Alaska Beringia |
op_source |
Quaternary Research volume 45, issue 2, page 226-240 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1996.0023 |
container_title |
Quaternary Research |
container_volume |
45 |
container_issue |
2 |
container_start_page |
226 |
op_container_end_page |
240 |
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1810485817329582080 |