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Middle Ordovician (late Dapingian–Darriwilian) conodonts from the Cow Head Group and Lower Head Formation, western Newfoundland, Canada

Publication: Canadian Journal of Earth Sciences
30 January 2012

Abstract

Middle Ordovician (late Dapingian–Darriwilian) conodonts from the Shallow Bay and Green Point formations, Cow Head Group, and the Lower Head Formation are recorded from three sections in Gros Morne National Park. The collection was investigated to clarify local age relationships between the uppermost part of the Cow Head Group and the interbedded to overlying sediments of the Lower Head Formation. Conodonts from St. Pauls Inlet North section indicate a middle Dapingian age for the upper lower Bed 13, latest Dapingian to early Darriwilian age for the upper Bed 13, an early Darriwilian (Dw 1) age for the top beds or Bed 15 of the Shallow Bay Formation at Lower Head, and the Lower Head Formation is referred to the Darriwilian. The uppermost part of the lower Bed 13 contains Periodon hankensis n. sp., Gothodus sp. A, and Diaphorodus delicatus followed by Periodon macrodentatus, Ansella longicuspica, Erraticodon n. sp. A, and Spinodus wardi n. sp. in the lowermost part of upper Bed 13. The fauna with P. macrodentatus is referred to the newly established Periodon macrodentatus conodont (phylo-)Zone, which is used for global correlation. The uppermost fauna in the Cow Head Group, i.e., Bed 15, includes Histiodella holodentata, Nealeodus martinpointensis, Oistodella pulchra, Dzikodus peavyi, and Yangtzeplacognathus n. sp. A , which are included in the Histiodella holodentata conodont (Bio-)Subzone of the Periodon macrodentatus Zone. Nealeodus is a new genus introduced here; Periodon hankensis n. sp. and Spinodus wardi n. sp. are new species described from the beds 13 and 15, respectively, in the Cow Head Group; Drepanodus aff. D. giganteus, Drepanodus aff. D. robustus, Erraticodon n. sp. A, Protopanderodus cf. P. cooperi, P. cf. P. varicostatus, and Yangtzeplacognathus n. sp. A are taxa referred to in open nomenclature.

Résumé

Des conodontes de l’Ordovicien moyen (Dapingien tardif – Darriwilien) des Formations de Shallow Bay et Green Point du Groupe de Cow Head et de la Formation de Lower Head sont documentés dans quatre coupes du parc national du Gros-Morne. La collection a été examinée afin de préciser les relations temporelles locales entre la portion sommitale du Groupe de Cow Head et les sédiments interstratifiés à sus-jacents de la Formation de Lower Head. Des conodontes de la coupe de la partie nord de l’anse St. Paul’s indiquent un âge dapingien moyen pour la partie supérieure du Lit 13 inférieur, un âge dapingien terminal à darriwilien précoce pour le Lit 13 supérieur et un âge darriwilien précoce (Dw 1) pour les lits sommitaux ou le Lit 15 de la Formation de Shallow Bay à Lower Head; et la Formation de Lower Head est affectée au Darriwilien. La partie sommitale du Lit 13 inférieur renferme Periodon hankensis n. sp., Gothodus sp. A et Diaphorodus delicatus, suivis de Periodon macrodentatus, Ansella longicuspica, Erraticodon n. sp. A et Spinodus wardi n. sp. dans la partie basale du Lit 13 supérieur. La faune à P. macrodentatus est affectée à la (phylo-) zone à conodonte Periodon macrodentatus nouvellement établie, utilisée pour la corrélation à l’échelle planétaire. La faune sommitale du Groupe de Cow Head, c’est-à-dire le Lit 15, comprend Histiodella holodentata, Nealeodus martinpointensis, Oistodella pulchra, Dzikodus peavyi et Yangtzeplacognathus n. sp. A et est incluse dans la (bio-) sous-zone à conodonte Histiodella holodentata de la zone à Periodon macrodentatus. Nealeodus est un nouveau genre introduit dans le présent article; Periodon hankensis n. sp. et Spinodus wardi n. sp. sont de nouvelles espèces décrites des Lits 13 et 15, respectivement, du Groupe du Cow Head; Drepanodus aff. D. giganteus, Drepanodus aff. D. robustus, Erraticodon n. sp. A, Protopanderodus cf. P. cooperi, P. cf. P. varicostatus et Yangtzeplacognathus n. sp. A sont des noms de taxons utilisés selon une nomenclature ouverte.

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cover image Canadian Journal of Earth Sciences
Canadian Journal of Earth Sciences
Volume 49Number 1January 2012
Pages: 59 - 90
Editor: Brendan Murphy

History

Received: 15 October 2010
Accepted: 1 September 2011
Version of record online: 30 January 2012

Notes

This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.

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Svend Stouge
Natural History Museum of Denmark, Geological Museum, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark.

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