Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia
This dissertation presents results from a multi-year interdisciplinary study of the Late Quaternary geomorphic history of northwest Calvert Island, British Columbia, Canada. There is a considerable knowledge gap in the region pertaining to Cordilleran ice cover and extent as well as landscape respon...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/7944 2023-05-15T16:41:28+02:00 Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia Eamer, Jordan Blair Reglin Walker, Ian J. Lian, Olav B. 2017 application/pdf http://hdl.handle.net/1828/7944 English en eng http://hdl.handle.net/1828/7944 Eamer JBR, Shugar DH, Walker IJ, Lian OB, Neudorf C, Telka A. In press. A unique late Pleistocene glacial re-advance during retreat of the Cordilleran Ice Sheet. Quaternary Research, manuscript # YQRES-D-16-00133. Eamer JBR, Shugar DH, Walker IJ, Lian OB, Neudorf C. 2017. Distinguishing depositional setting for sandy deposits in coastal landscapes using grain shape. Journal of Sedimentary Research, 87(1): 1-11. http://dx.doi.org/10.2110/jsr.2016.92 Available to the World Wide Web http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ CC-BY-NC-ND Cordilleran Ice Sheet Late Quaternary geomorphic mapping sedimentology stratigraphy palaeoecology aeolian Thesis 2017 ftuvicpubl https://doi.org/10.2110/jsr.2016.92 2022-05-19T06:11:17Z This dissertation presents results from a multi-year interdisciplinary study of the Late Quaternary geomorphic history of northwest Calvert Island, British Columbia, Canada. There is a considerable knowledge gap in the region pertaining to Cordilleran ice cover and extent as well as landscape response to a uniquely stable relative sea-level history. The objective of this study was to reconstruct this regional landscape response to deglaciation including post-LGM ice cover and extent, relative sea-level changes, coastal landform development, and climate and ecological variance. Methods used to inform this reconstruction included airborne lidar, aerial photography interpretation, sedimentary stratigraphy and detailed sedimentology of samples from shovel pits and lake cores, surficial geology and geomorphic mapping, palaeoecological examinations, and the development of a geochronology using radiocarbon and optical dating. To assist with landscape reconstruction, a new method was developed and used to differentiate littoral and aeolian sands in sediment samples that range in age from Mid to Late Holocene by using modern reference samples. The method utilized a standard optical microscope paired with freely available software (ImageJ) to characterize grain shape parameters. The method was tested on nearly 6,000 sand grains from samples of known and hypothesized depositional settings and was able to correctly identify the depositional setting for 76% of the samples. After testing, the method was used to differentiate littoral and aeolian sands in a number of shovel pit, exposure, and core sediment samples to give context to stratigraphic and geomorphic interpretations. A short-lived Late Pleistocene re-advance of Cordilleran ice occurred in the study area, with radiocarbon ages indicating ice advanced to, and then retreated from, the western edge of Calvert Island between 14.2 and 13.8 ka cal BP, respectively. Sedimentological and palaeoecological information that suggests a cold climate and advancing/retreating ... Thesis Ice Sheet University of Victoria (Canada): UVicDSpace British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada Journal of Sedimentary Research 87 1 1 11 |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
Cordilleran Ice Sheet Late Quaternary geomorphic mapping sedimentology stratigraphy palaeoecology aeolian |
spellingShingle |
Cordilleran Ice Sheet Late Quaternary geomorphic mapping sedimentology stratigraphy palaeoecology aeolian Eamer, Jordan Blair Reglin Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia |
topic_facet |
Cordilleran Ice Sheet Late Quaternary geomorphic mapping sedimentology stratigraphy palaeoecology aeolian |
description |
This dissertation presents results from a multi-year interdisciplinary study of the Late Quaternary geomorphic history of northwest Calvert Island, British Columbia, Canada. There is a considerable knowledge gap in the region pertaining to Cordilleran ice cover and extent as well as landscape response to a uniquely stable relative sea-level history. The objective of this study was to reconstruct this regional landscape response to deglaciation including post-LGM ice cover and extent, relative sea-level changes, coastal landform development, and climate and ecological variance. Methods used to inform this reconstruction included airborne lidar, aerial photography interpretation, sedimentary stratigraphy and detailed sedimentology of samples from shovel pits and lake cores, surficial geology and geomorphic mapping, palaeoecological examinations, and the development of a geochronology using radiocarbon and optical dating. To assist with landscape reconstruction, a new method was developed and used to differentiate littoral and aeolian sands in sediment samples that range in age from Mid to Late Holocene by using modern reference samples. The method utilized a standard optical microscope paired with freely available software (ImageJ) to characterize grain shape parameters. The method was tested on nearly 6,000 sand grains from samples of known and hypothesized depositional settings and was able to correctly identify the depositional setting for 76% of the samples. After testing, the method was used to differentiate littoral and aeolian sands in a number of shovel pit, exposure, and core sediment samples to give context to stratigraphic and geomorphic interpretations. A short-lived Late Pleistocene re-advance of Cordilleran ice occurred in the study area, with radiocarbon ages indicating ice advanced to, and then retreated from, the western edge of Calvert Island between 14.2 and 13.8 ka cal BP, respectively. Sedimentological and palaeoecological information that suggests a cold climate and advancing/retreating ... |
author2 |
Walker, Ian J. Lian, Olav B. |
format |
Thesis |
author |
Eamer, Jordan Blair Reglin |
author_facet |
Eamer, Jordan Blair Reglin |
author_sort |
Eamer, Jordan Blair Reglin |
title |
Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia |
title_short |
Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia |
title_full |
Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia |
title_fullStr |
Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia |
title_full_unstemmed |
Reconstruction of the Late Pleistocene and Holocene geomorphology of northwest Calvert Island, British Columbia |
title_sort |
reconstruction of the late pleistocene and holocene geomorphology of northwest calvert island, british columbia |
publishDate |
2017 |
url |
http://hdl.handle.net/1828/7944 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
British Columbia Canada |
geographic_facet |
British Columbia Canada |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
http://hdl.handle.net/1828/7944 Eamer JBR, Shugar DH, Walker IJ, Lian OB, Neudorf C, Telka A. In press. A unique late Pleistocene glacial re-advance during retreat of the Cordilleran Ice Sheet. Quaternary Research, manuscript # YQRES-D-16-00133. Eamer JBR, Shugar DH, Walker IJ, Lian OB, Neudorf C. 2017. Distinguishing depositional setting for sandy deposits in coastal landscapes using grain shape. Journal of Sedimentary Research, 87(1): 1-11. http://dx.doi.org/10.2110/jsr.2016.92 |
op_rights |
Available to the World Wide Web http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.2110/jsr.2016.92 |
container_title |
Journal of Sedimentary Research |
container_volume |
87 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
11 |
_version_ |
1766031905099087872 |