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Depth related brachiopod faunas from the lower Cambrian Forteau Formation of southern Labrador and western Newfoundland, Canada
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
2017 (English)In: Palaeontologia Electronica, ISSN 1935-3952, E-ISSN 1094-8074, Vol. 20, no 3, 1-52 p., 54AArticle in journal (Refereed) Published
Abstract [en]

A diverse fauna of organophosphatic brachiopods is described from the late early Cambrian (Series 2, Stage 3-4) Forteau Formation of southern Labrador and western Newfoundland. The total fauna includes 11 species representing a wide selection of Cambrian brachiopod groups. Three distinct assemblages are recognized: Assemblages1 and 2 are found in shallow water carbonates in association with archaeocyathans in southern Labrador and the western side of the Great Northern Peninsula of western Newfoundland. Assemblage 3 is found in a distal shelf setting of Gros Morne National Park. Assemblages 1 and 2 are found in stratigraphic continuity and definetwo brachiopod biozones, a lower Hadrotreta taconica zone and a higher Paterina zone, respectively. The presence of H. taconica in brachiopod Assemblage 3 possibly indicates time equivalence of Assemblage 1 but in a deep water setting. The identification of distinct time equivalent brachiopod Assemblages (1 and 3) in shallow and deep water environments of the Forteau Formation allow for the first time an analysis of environmental constraints determining the distribution of individual brachiopod taxa in the lower Cambrian succession of eastern Laurentia. Comparison to faunas from other areas indicates that the identified distributional patterns can be extended to other brachiopod faunas found along the Cambrian palaeocoast/margin of eastern Laurentia. The study indicates that specific brachiopod taxa can be used as indicators of palaeodepth; Botsfordia caelata in shallow environments and Eoobolus priscus and Eothele tubulus in deeper water. The following new taxa are described: Kyrshabaktella diabolan. sp., Pustulobolus triangulus n. gen et n. sp., Acrothyra bonnia n. sp.

Place, publisher, year, edition, pages
2017. Vol. 20, no 3, 1-52 p., 54A
Keyword [en]
Brachiopoda; Linguliformea; Cambrian; Palaeoecology; Biostratigraphy; Laurentia
National Category
Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-2499DOI: 10.26879/775OAI: oai:DiVA.org:nrm-2499DiVA: diva2:1155481
Funder
Swedish Research Council, VR2016-04610
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2017-11-27Bibliographically approved

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Publisher's full texthttp://palaeo-electronica.org/content/2017/2048-brachiopods-of-the-forteau-formation

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