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Potential foraminiferal markers for the Visean–Serpukhovian and Serpukhovian–Bashkirian boundaries—a case-study from Central Morocco

Published online by Cambridge University Press:  14 July 2015

Pedro Cózar
Affiliation:
1UEI y Depto. de Paleontología, Instituto de Geología Económica/Instituto de Geociencias CSIC-UCM, c/José Antonio Novais 2, 28040-Madrid, Spain, , , ,
Ismail Said
Affiliation:
1UEI y Depto. de Paleontología, Instituto de Geología Económica/Instituto de Geociencias CSIC-UCM, c/José Antonio Novais 2, 28040-Madrid, Spain, , , ,
Ian D. Somerville
Affiliation:
2UCD School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland,
Daniel Vachard
Affiliation:
3Université de Lille 1, UFR Sciences de la Terre, UMR 8157 du CNRS, Bâtiment SN 5, Villeneuve d'Ascq 59655, France,
Paula Medina-Varea
Affiliation:
1UEI y Depto. de Paleontología, Instituto de Geología Económica/Instituto de Geociencias CSIC-UCM, c/José Antonio Novais 2, 28040-Madrid, Spain, , , ,
Sergio Rodríguez
Affiliation:
1UEI y Depto. de Paleontología, Instituto de Geología Económica/Instituto de Geociencias CSIC-UCM, c/José Antonio Novais 2, 28040-Madrid, Spain, , , ,
Mostafa Berkhli
Affiliation:
4Université Moulay Ismaïl, Faculté des Sciences, Département de Géologie, UFR analyse et prospection des bassins sédimentaires, BP. 11201 Zitanne, Meknès, Morocco,

Abstract

The Carboniferous succession in Adarouch (Central Morocco, north of the Atlas Transform Fault) contains thick carbonate beds including upper Visean, Serpukhovian and basal Bashkirian rocks. Foraminifers enable precise recognition of the Visean/Serpukhovian (V/S), early/late Serpukhovian (eS/lS) and Serpukhovian/Bashkirian (S/B) boundaries. Insolentitheca horrida, Loeblichia ukrainica, “Millerella” spp. and Endostaffella? sp. 2 are regarded as regionally useful indices to the V/S boundary, whereas Eostaffellina spp., Eostaffella pseudostruvei and some evolved species of Archaediscus exhibit greater reliability for worldwide correlation of this level. Similarly, the eS/lS boundary is marked locally by Brenckleina rugosa, Eosigmoilina sp., and Monotaxinoides spp. and globally by Loeblichia minima, Bradyina cribrostomata, Plectostaffella spp., Eostaffellina “protvae” and “Turrispiroides”, and the S/B boundary is marked locally by Globivalulina bulloides and globally by Seminovella elegantula, and Novella?. Occurrences of these taxa in Morocco allow correlations with the Moscow Basin, the Urals, the Donetz Basin and North America. The Moroccan assemblages share few taxa in common with Saharan basins south of the Atlas Transform Fault. Correlations with western European basins are difficult because of the paucity in the latter of foraminiferal-bearing carbonate strata.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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