Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands
Examination of the Late Ordovician strophomenid brachiopod Rafinesquina lata Whiteaves, 1896 from the Selkirk Member of the Red River Formation of southern Manitoba reveals that the two syntypes actually represent two genera and two species, Oepikina lata and Kjaerina hartae n.sp. Specimens typicall...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1995
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e95-102 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-102 |
id |
crcansciencepubl:10.1139/e95-102 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e95-102 2024-06-23T07:53:34+00:00 Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands Jin, Jisuo Caldwell, W. G. E. Norford, B. S. 1995 http://dx.doi.org/10.1139/e95-102 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-102 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 32, issue 8, page 1255-1266 ISSN 0008-4077 1480-3313 journal-article 1995 crcansciencepubl https://doi.org/10.1139/e95-102 2024-06-06T04:11:18Z Examination of the Late Ordovician strophomenid brachiopod Rafinesquina lata Whiteaves, 1896 from the Selkirk Member of the Red River Formation of southern Manitoba reveals that the two syntypes actually represent two genera and two species, Oepikina lata and Kjaerina hartae n.sp. Specimens typically described as Rafinesquina lata by Whiteaves are large, thick-shelled, strongly but evenly concavo-convex, with randomly spaced, fine, concentric growth lamellae and a high ventral interarea. Affinity of the species to Oepikina lies in its unequal parvicostellae of the ventral valve, conspicuous dorsal peripheral rim, robust cardinal process, and strong lateral trans-muscle septa. Kjaerina hartae is easily distinguished from O. lata by its strongly geniculate and less massive shell, a much lower ventral interarea, prominent concentric rugae, and, internally, considerably weaker trans-muscle septa. The shells of O. lata and K. hartae are unusually large and suggest an open, shallow- and warm-water, subtidal depositional environment for the original sediments of the Selkirk Member of the Red River Formation. Common occurrences of K. hartae in the upper Portage Chute and Surprise Creek formations (Bad Cache Rapids Group) of the Hudson Bay Lowlands, together with other brachiopods and other groups of fossils, support the concept that the epicontinental seas once covering the Hudson Platform and the Williston Platform were connected during Late Ordovician (Maysvillian) time. Article in Journal/Newspaper Hudson Bay Canadian Science Publishing Bad Cache Rapids ENVELOPE(-95.104,-95.104,57.916,57.916) Hudson Hudson Bay Portage Chute ENVELOPE(-95.334,-95.334,57.821,57.821) Canadian Journal of Earth Sciences 32 8 1255 1266 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Examination of the Late Ordovician strophomenid brachiopod Rafinesquina lata Whiteaves, 1896 from the Selkirk Member of the Red River Formation of southern Manitoba reveals that the two syntypes actually represent two genera and two species, Oepikina lata and Kjaerina hartae n.sp. Specimens typically described as Rafinesquina lata by Whiteaves are large, thick-shelled, strongly but evenly concavo-convex, with randomly spaced, fine, concentric growth lamellae and a high ventral interarea. Affinity of the species to Oepikina lies in its unequal parvicostellae of the ventral valve, conspicuous dorsal peripheral rim, robust cardinal process, and strong lateral trans-muscle septa. Kjaerina hartae is easily distinguished from O. lata by its strongly geniculate and less massive shell, a much lower ventral interarea, prominent concentric rugae, and, internally, considerably weaker trans-muscle septa. The shells of O. lata and K. hartae are unusually large and suggest an open, shallow- and warm-water, subtidal depositional environment for the original sediments of the Selkirk Member of the Red River Formation. Common occurrences of K. hartae in the upper Portage Chute and Surprise Creek formations (Bad Cache Rapids Group) of the Hudson Bay Lowlands, together with other brachiopods and other groups of fossils, support the concept that the epicontinental seas once covering the Hudson Platform and the Williston Platform were connected during Late Ordovician (Maysvillian) time. |
format |
Article in Journal/Newspaper |
author |
Jin, Jisuo Caldwell, W. G. E. Norford, B. S. |
spellingShingle |
Jin, Jisuo Caldwell, W. G. E. Norford, B. S. Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands |
author_facet |
Jin, Jisuo Caldwell, W. G. E. Norford, B. S. |
author_sort |
Jin, Jisuo |
title |
Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands |
title_short |
Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands |
title_full |
Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands |
title_fullStr |
Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands |
title_full_unstemmed |
Late Ordovician brachiopods Rafinesquina lata Whiteaves, 1896 and Kjaerina hartae n.sp. from southern Manitoba and the Hudson Bay Lowlands |
title_sort |
late ordovician brachiopods rafinesquina lata whiteaves, 1896 and kjaerina hartae n.sp. from southern manitoba and the hudson bay lowlands |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/e95-102 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-102 |
long_lat |
ENVELOPE(-95.104,-95.104,57.916,57.916) ENVELOPE(-95.334,-95.334,57.821,57.821) |
geographic |
Bad Cache Rapids Hudson Hudson Bay Portage Chute |
geographic_facet |
Bad Cache Rapids Hudson Hudson Bay Portage Chute |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_source |
Canadian Journal of Earth Sciences volume 32, issue 8, page 1255-1266 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e95-102 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
32 |
container_issue |
8 |
container_start_page |
1255 |
op_container_end_page |
1266 |
_version_ |
1802645289152020480 |