Quaternary interglacial and associated deposits in southwest Newfoundland
A coastal cliff section near Codroy, Newfoundland exposes five distinctive lithologic units, which are defined lithologically and structurally as colluvial, lacustrine, or glacial in origin. They have been preserved in a gypsum karst depression, but continuing karst evolution has disturbed their ori...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1982
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e82-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/e82-033 |
id |
crcansciencepubl:10.1139/e82-033 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e82-033 2024-09-15T18:20:05+00:00 Quaternary interglacial and associated deposits in southwest Newfoundland Brookes, Ian A. McAndrews, John H. von Bitter, Peter H. 1982 http://dx.doi.org/10.1139/e82-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/e82-033 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 19, issue 3, page 410-423 ISSN 0008-4077 1480-3313 journal-article 1982 crcansciencepubl https://doi.org/10.1139/e82-033 2024-07-25T04:10:06Z A coastal cliff section near Codroy, Newfoundland exposes five distinctive lithologic units, which are defined lithologically and structurally as colluvial, lacustrine, or glacial in origin. They have been preserved in a gypsum karst depression, but continuing karst evolution has disturbed their original attitudes.The two oldest units, 5 and 4, were formed by sidewall slumping of local bedrock and earlier glacial material from the failing rim of a newly formed sinkhole. Unit 3 represents tranquil sedimentation of thin sand and silt–clay laminae, first in a freshwater sinkhole pond, then in brackish marine waters that entered after breaching of its seaward wall, and finally again in fresh water as sea level fell below the sill of the small embayment. Units 2 and 1 are glacial deposits laid down over older units after a second major sinkhole collapse. Collapse has continued to the present day.Pollen and spores from unit 3 indicate that during its deposition regional vegetation changed from tundra (Zone A) to boreal forest (Zone B), and back to tundra (Zone C), through an interglacial cycle of vegetation change. Balsam fir wood from Zone B is radiocarbon-dated to > 40 000 BP (I-10203).Foraminifera from unit 3 indicate that brackish marine conditions prevailed before Zone B times, and that nearshore fully marine conditions briefly prevailed in Zone B times. Zone B is thus assigned full interglacial status, based on pollen and foraminiferal evidence, and is tentatively assigned to the Sangamonian for want of indications to the contrary and for economy of interpretation. The overlying glaciogenic units 1 and 2 are thus probably of early Wisconsinan age.Calcite crystals, possibly pseudomorphous, found within Zone B of unit 3, were radiocarbon-dated at 30 000 ± 1450 BP (UQ-115). δ 18 O values of −6.8 to −7.5‰ (versus PDB) indicate replacement by calcite under conditions similar to present. δ 13 C values of −24.00 to −26.24‰ (versus PDB) indicate that carbonate carbon was supplied by decay of local organic matter. The ... Article in Journal/Newspaper Newfoundland Tundra Canadian Science Publishing Canadian Journal of Earth Sciences 19 3 410 423 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
A coastal cliff section near Codroy, Newfoundland exposes five distinctive lithologic units, which are defined lithologically and structurally as colluvial, lacustrine, or glacial in origin. They have been preserved in a gypsum karst depression, but continuing karst evolution has disturbed their original attitudes.The two oldest units, 5 and 4, were formed by sidewall slumping of local bedrock and earlier glacial material from the failing rim of a newly formed sinkhole. Unit 3 represents tranquil sedimentation of thin sand and silt–clay laminae, first in a freshwater sinkhole pond, then in brackish marine waters that entered after breaching of its seaward wall, and finally again in fresh water as sea level fell below the sill of the small embayment. Units 2 and 1 are glacial deposits laid down over older units after a second major sinkhole collapse. Collapse has continued to the present day.Pollen and spores from unit 3 indicate that during its deposition regional vegetation changed from tundra (Zone A) to boreal forest (Zone B), and back to tundra (Zone C), through an interglacial cycle of vegetation change. Balsam fir wood from Zone B is radiocarbon-dated to > 40 000 BP (I-10203).Foraminifera from unit 3 indicate that brackish marine conditions prevailed before Zone B times, and that nearshore fully marine conditions briefly prevailed in Zone B times. Zone B is thus assigned full interglacial status, based on pollen and foraminiferal evidence, and is tentatively assigned to the Sangamonian for want of indications to the contrary and for economy of interpretation. The overlying glaciogenic units 1 and 2 are thus probably of early Wisconsinan age.Calcite crystals, possibly pseudomorphous, found within Zone B of unit 3, were radiocarbon-dated at 30 000 ± 1450 BP (UQ-115). δ 18 O values of −6.8 to −7.5‰ (versus PDB) indicate replacement by calcite under conditions similar to present. δ 13 C values of −24.00 to −26.24‰ (versus PDB) indicate that carbonate carbon was supplied by decay of local organic matter. The ... |
format |
Article in Journal/Newspaper |
author |
Brookes, Ian A. McAndrews, John H. von Bitter, Peter H. |
spellingShingle |
Brookes, Ian A. McAndrews, John H. von Bitter, Peter H. Quaternary interglacial and associated deposits in southwest Newfoundland |
author_facet |
Brookes, Ian A. McAndrews, John H. von Bitter, Peter H. |
author_sort |
Brookes, Ian A. |
title |
Quaternary interglacial and associated deposits in southwest Newfoundland |
title_short |
Quaternary interglacial and associated deposits in southwest Newfoundland |
title_full |
Quaternary interglacial and associated deposits in southwest Newfoundland |
title_fullStr |
Quaternary interglacial and associated deposits in southwest Newfoundland |
title_full_unstemmed |
Quaternary interglacial and associated deposits in southwest Newfoundland |
title_sort |
quaternary interglacial and associated deposits in southwest newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/e82-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/e82-033 |
genre |
Newfoundland Tundra |
genre_facet |
Newfoundland Tundra |
op_source |
Canadian Journal of Earth Sciences volume 19, issue 3, page 410-423 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e82-033 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
19 |
container_issue |
3 |
container_start_page |
410 |
op_container_end_page |
423 |
_version_ |
1810458446300971008 |