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Summary: Differences in lithofacies and biofacies suggest that lowcr Paleozoic rocks now cxposed in Arctic Alaska and the Canadian Arctic Islands did not form as part of a single depositional system. Lithologie contrasts are noted in shal-low- and deep-watcr strata and are especially marked in Ordov...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.563.3477 2023-05-15T14:48:14+02:00 Matches The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.3477 http://alaska.usgs.gov/staff/geology/bradley/pubs/2000_Dumoulin_Arctic_cono_biogeog.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.3477 http://alaska.usgs.gov/staff/geology/bradley/pubs/2000_Dumoulin_Arctic_cono_biogeog.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://alaska.usgs.gov/staff/geology/bradley/pubs/2000_Dumoulin_Arctic_cono_biogeog.pdf text ftciteseerx 2016-01-08T12:08:48Z Summary: Differences in lithofacies and biofacies suggest that lowcr Paleozoic rocks now cxposed in Arctic Alaska and the Canadian Arctic Islands did not form as part of a single depositional system. Lithologie contrasts are noted in shal-low- and deep-watcr strata and are especially marked in Ordovician and Silurian rocks. A widespread intraplatform basin of Early and Middle Ordovician age in northern Alaska has no counterpart in the Canaelian Arctic, anel the regional drowning anel backstepping of the Silurian shelf margin in Canaela has no known parallel in northern Alaska. Lower Paleozoie basinal facics in northern Alaska are chiefly silieiclastic, whereas resedimented carbonates are volumetrieally important in Canada. Miero- anel maerofossil assemblages from northern Alaska contain elements typical of both Sibcrian anel Laurentian biotie provinees; co-eval Canaelian Aretie assemblages contain Laurentian forms but lack Siberian species. Siberian affinities in northern Alaskan bioras persist from at least Mielellc Cambrian through Mississippian time anel appear to decrease in intensity frorn present-day west to east. Our lithologie anel biogeographie data are most eom-patible with the hypothesis that northern Alaska-Chukotka formed a discrcte tectonic block situateel between Siberia anel Laurentia in early Paleozoie time. If Arctic Alaska was juxtaposeel with the Canaelian Arctie prior to opening of the Canada basin, biotic constraints suggest that such juxtaposition took place no earlier than late Palcozoie time. Text Arctic canada basin Chukotka Alaska Siberia Unknown Arctic Canada |
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Summary: Differences in lithofacies and biofacies suggest that lowcr Paleozoic rocks now cxposed in Arctic Alaska and the Canadian Arctic Islands did not form as part of a single depositional system. Lithologie contrasts are noted in shal-low- and deep-watcr strata and are especially marked in Ordovician and Silurian rocks. A widespread intraplatform basin of Early and Middle Ordovician age in northern Alaska has no counterpart in the Canaelian Arctic, anel the regional drowning anel backstepping of the Silurian shelf margin in Canaela has no known parallel in northern Alaska. Lower Paleozoie basinal facics in northern Alaska are chiefly silieiclastic, whereas resedimented carbonates are volumetrieally important in Canada. Miero- anel maerofossil assemblages from northern Alaska contain elements typical of both Sibcrian anel Laurentian biotie provinees; co-eval Canaelian Aretie assemblages contain Laurentian forms but lack Siberian species. Siberian affinities in northern Alaskan bioras persist from at least Mielellc Cambrian through Mississippian time anel appear to decrease in intensity frorn present-day west to east. Our lithologie anel biogeographie data are most eom-patible with the hypothesis that northern Alaska-Chukotka formed a discrcte tectonic block situateel between Siberia anel Laurentia in early Paleozoie time. If Arctic Alaska was juxtaposeel with the Canaelian Arctie prior to opening of the Canada basin, biotic constraints suggest that such juxtaposition took place no earlier than late Palcozoie time. |
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The Pennsylvania State University CiteSeerX Archives |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.3477 http://alaska.usgs.gov/staff/geology/bradley/pubs/2000_Dumoulin_Arctic_cono_biogeog.pdf |
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Arctic Canada |
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Arctic Canada |
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Arctic canada basin Chukotka Alaska Siberia |
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Arctic canada basin Chukotka Alaska Siberia |
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http://alaska.usgs.gov/staff/geology/bradley/pubs/2000_Dumoulin_Arctic_cono_biogeog.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.3477 http://alaska.usgs.gov/staff/geology/bradley/pubs/2000_Dumoulin_Arctic_cono_biogeog.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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