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Ostracods and rock facies across the Emsian/Eifelian boundary at Couvin (Dinant Synclinorium, Belgium)

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Abstract

A moderately rich ostracod fauna is reported from the upper part of the St. Joseph Formation (Fm), the Eau Noire Fm and the lower part of the Couvin Fm in the Eau Noire section located nearby Couvin. The section that crosses the Emsian/Eifelian boundary belongs entirely to the Couvinian historical stage. The ostracod fauna observed appertains to the Eifelian Mega-Assemblage and is indicative, in the Eau Noire Fm and in the Couvin Fm, of continuous shallow open-marine environments close to the fair-weather wave-base. The sampling and the number of ostracods extracted from the St. Joseph Fm are not sufficient to make environmental inferences and the study does not demonstrate an abnormal change in the ostracod fauna neither in relation with the Eau Noire Fm/Couvin Fm boundary, nor in relation with the Emsian/Eifelian boundary. The ostracods present near the Emsian/Eifelian boundary are mentioned for the first time in the southern border of the Dinant Synclinorium and they display close relations with the Eifel Mountains (Germany) and the Holy Cross Mountains (Poland).

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Acknowledgements

This paper is a contribution to IGCP project n. 596 ‘Climate change and biodiversity patterns in Mid-Paleozoic (Early Devonian to Lower Carboniferous)’. We appreciate the helpful reviews of our manuscript by Claudia Dojen (Landesmuseum Kärnten, Austria) and Bruno Milhau (Université catholique de Lille).

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Correspondence to Jean-Georges Casier.

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This article is a contribution to the special issue “Climate change and biodiversity patterns in the mid-Palaeozoic”.

Appendix 1: Taxonomic and stratigraphical positions of ostracod taxa in the Eau Noire section

Appendix 1: Taxonomic and stratigraphical positions of ostracod taxa in the Eau Noire section

Order Palaeocopida Henningsmoen, 1953

Suborder Palaeocopina Henningsmoen, 1953

Superfamily Kirkbyoidea Ulrich and Bassler, 1906

Family Arcyzonidae Kesling, 1961

Obotritia eifeliensis Adamczak, 1968 (Fig. 3a). ENO65.

Superfamily Hollinoidea Swartz, 1936

Superfamily Beyrichioidea Matthew, 1886

Family Beyrichidae Matthew, 1886

Kozlowskiella kozlowskii (Přibyl, 1953) (Fig. 3b). EN64; ENO5, 139.

Kozlowskiella sp. A (Fig. 3c). EN32, 44, 57, 139 ?; ENO95.

Parakozlowskiella sp. indet. (Fig. 3d). EN6, 35.

Ochescapha ornatissima (Gürich, 1896) (Fig. 3e). EN31, 35, 40.

Ochescapha mobilis delicata Adamczak, 1968 (Fig. 3f). EN35.

Superfamily Primitiopsoidea Swartz, 1936

Family Primitiopsidae Swartz, 1936

Kielciella fastigans (Becker, 1964) (Fig. 3g). ENO62, 65, 69.

Guerichiella septentrionensis Adamczak, 1968 (Fig. 3h). EN31, 35, 64.

Guerichiella sp. A, aff. meridiensis Adamczak, 1968 (Fig. 3i). ENO62.

Superfamily Aparchitoidea Jones, 1901

Family Aparchitidae Jones, 1901

Aparchites? sp. A (Fig. 3j). EN55, 57, 66, 109, 129; ENO30?, 66, 69, 95.

Aparchites sp. indet. (Fig. 3k). ENO62.

Aparchites? sp. indet. (Fig. 3l). ENO35, 69.

Family Rohzdestvenskayitidae Mc Gill, 1966

Fellerites sp. indet. (Fig. 3m). EN57.

Superfamily unknown

Family Scrobiculidae Posner, 1951

Amphissella calceolae (Gürich, 1896) (Fig. 3n). EN51; ENO66?, 74.

Suborder Paraparchiticopina Gramm in Gramm and Ivanov (1975)

Superfamily Paraparchitoidea Scott, 1959

Family Paraparchitidae Scott, 1959

Coeloenellina cf. cuertenensis Becker, 1964 (Fig. 3o). EN19.

Suborder Platycopina Sars, 1866

Superfamily Kloedenelloidea Ulrich and Bassler, 1908

Family Kloedenellidae Ulrich and Bassler, 1908

Uchtovia kloedenellides (Adamczak, 1968) (Fig. 3p). EN55.

Uchtovia testis (Adamczak, 1968) (Fig. 3q). EN64?, 139; ENO7, 62, 65?

Order Podocopida Sars, 1866

Suborder Metacopina Sylvester-Bradley, 1961

Superfamily Healdioidea Harlton, 1933

Family Healdiidae Harlton, 1933

? Cytherellina sp. A Becker 1965 (Fig. 3r). EN91; ENO95.

Cytherellina sp. B, aff. perlonga (Kummerow, 1953) (Fig. 3s). ENO65.

Superfamily Thlipsuroidea Ulrich, 1894

Family Thlipsuridae Ulrich, 1894

Polyzygia? sp. indet. (Fig. 3t). ENO30.

Family Bufinidae Sohn and Stover, 1961

? Bufina granulata Adamczak, 1976e ENO33.

Superfamily Quasillitoidea Coryell and Malkin, 1936

Family Ropolonellidae Coryell and Malkin, 1936

Ropolonellus robustus Adamczak, 1976 (Fig. 3u). EN31, 150, 162; ENO66?, 74.

Family Quasillitidae Coryell and Malkin, 1936

Jenningsina catenulata (Van Pelt, 1933) (Fig. 4a). EN162?, EN104.

Amphicostella sp. indet. (Fig. 4b). ENO32.

Suborder Podocopina Sars, 1866

Superfamily Bairdiocypridoidea Shaver, 1961

Family Pachydomellidae Berdan and Sohn, 1961

Ampuloides sp. indet. (Figs. 4c, d). EN64; ENO35?, 64, 104?

Pachydomella? cf. reticulata Adamczak, 1976 (Fig. 4e). ENO99.

Tubulibairdia aff. cognata (Krömmelbein, 1955) (Fig. 4f). EN7?, 31, 35, 38, 55, 57, 62, 64, 91, 92, 126, 129, 139, 150; ENO92?

Microcheilinella affinis Polenova, 1955 (Fig. 4g). EN6, 62, 64, 91, 117 ; ENO7, 32?, 49, 52, 55, 57, 65, 69, 74.

Micronewsomites sp. A, aff. notabilis (Polenova, 1955) (Fig. 4h). EN35?, 66, 77?; ENO32, 57, 66, 99?

Family Bairdiocyprididae Shaver, 1961

Praepilatina sp. A (Fig. 4i). EN57; ENO32?, 74, 93?

Praepilatina sp. indet. (Fig. 4j). EN91.

Bairdiocypris soetenica Becker, 1965 (Fig. 4k). EN55, 57, 64, 91, 126, 150; ENO55?, 62, 64, 69, 74?

Bairdiocypris sp., aff. lamellaris Adamczak, 1976 (Fig. 4l). EN64, 153; ENO62.

Bairdiocypris sp. A (Fig. 4m). EN139; ENO92.

Bairdiocypris sp. indet. EN44, 55, 57, 60, 62, 64, 66, 126, 131, 150, 162; ENO2, 5, 7, 52, 53, 62, 65, 69, 74, 88, 93.

Condracypris? circumvallata (Kummerow, 1953) (Fig. 4n). ENO33, 52?, 55?, 69.

Family Bairdiidae Sars, 1988

Bairdia cultrijugati Krömmelbein, 1950 (Fig. 4o). EN7, 18, 31, 35, 38, 40, 44, 51 ?, 52?, 54, 55, 57, 60, 62, 64, 66, 73, 82, 84, 91, 92, 102, 109, 117, 125, 126, 129, 131, 139, 149, 150, 153; ENO2?, 49, 52, 53, 55, 57, 62, 64, 65, 66, 69, 74, 76, 92, 93, 95, 99, 104.

Bairdia dispar Adamczak, 1976 (Fig. 4p). EN31.

Bairdia sp. A (Fig. 4q). EN77, 139.

Acratia? sp. indet (Fig. 4r). EN66; ENO53, 62,

Bairdiacypris antiqua (Pokorńy, 1951) (Fig. 4s). EN40, 44, 52?, 55, 57, 60, 62, 64, 66, 77, 92; ENO32, 52, 57, 62, 64, 66, 69, 92, 93, 99.

Bairdiacypris sp. indet. EN92; ENO44, 49, 92.

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Casier, JG., Maillet, S. & Préat, A. Ostracods and rock facies across the Emsian/Eifelian boundary at Couvin (Dinant Synclinorium, Belgium). Palaeobio Palaeoenv 97, 439–448 (2017). https://doi.org/10.1007/s12549-016-0236-1

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