Late Ordovician brachiopods from east-central Alaska, northwestern margin of Laurentia
A Late Ordovician brachiopod fauna from the Black River quadrangle (D-1 1:63,360 scale) of east-central Alaska comprises taxa typical of the Late Ordovician brachiopod fauna in the pericratonic epeiric seas of Laurentia, including Hesperorthis pyramidalis, Plaesiomys occidentalis, Eoplectodonta sp.,...
| Main Authors: | , |
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| Format: | Dataset |
| Language: | unknown |
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2020
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| Online Access: | https://zenodo.org/record/4995620 https://doi.org/10.5061/dryad.31zcrjdh2 |
| Summary: | A Late Ordovician brachiopod fauna from the Black River quadrangle (D-1 1:63,360 scale) of east-central Alaska comprises taxa typical of the Late Ordovician brachiopod fauna in the pericratonic epeiric seas of Laurentia, including Hesperorthis pyramidalis, Plaesiomys occidentalis, Eoplectodonta sp., Holtehdalina sp., Leptaena sp., Brevilamnulella minuta n. sp., Tcherskidium tenuicostatum n. sp., Rhynchotrema iowense, and Whitfieldella sp. The presence of Plaesiomys occidentalis and Tcherskidium tenuicostata n. sp. indicates a latest Katian age by correlation with similar species in the Mackenzie Mountains, southern Manitoba, Anticosti Island, the American mid-continent, Kolyma, and Siberia. Cluster analysis based on 20 well-studied late Katian brachiopod faunas from various regions within Laurentia and elsewhere in other tectonic plates suggests that the small brachiopod faunule from Alaska has the strongest paleobiogeographic affinity with Laurentia, confirming that the Black River quadrangle of Alaska was part of Laurentia during the Late Ordovician. The dataset is binary: present = 1, absent = 0 Funding provided by: Natural Sciences and Engineering Research Council of CanadaCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100000038Award Number: Discovery Grant Cluster analysis of late Katian (Richmondian) brachiopod faunas from Laurentia and other tectonic plates (Fig. 2 of the main paper) is based on following sources (Table S1). Anticosti Island, Quebec, Vaureal Formation (Dewing, 2000, Jin and Zhan, 2008). Cincinnati Arch, Richmondian strata of Ohio-Kentucky-Indiana border region (Davis, 1985). East-central Alaska (this study). Farewell Terrane, Upper Katian strata, western Alaska (Rasmussen et al., 2012). Hudson Bay, Churchill River Group (Jin et al., 1997). Manitoba, Stony Mountain Formation (Jin and Zhan, 2001). Mackenzie Mountains, western marginal platform; lower Whittaker Formation (updated, this study). Iowa, upper Maquoketa Group (Wang, 1949). Texas, Montoya Group, Trans-Pecos Texas ... |
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