Broeckina gassoensis sp. nov., a larger foraminiferal index fossil for the middle Coniacian shallow-water deposits of the Pyrenean Basin (NE Spain) |
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| Institution: | 1. Departament de Geologia (Paleontologia), Universitat Autònoma de Barcelona, Spain;2. DiSTAR, Università di Napoli “Federico II”, Italy;3. Museu de Ciències Naturals de Barcelona (Paleontologia), Barcelona;4. Institut für Erd- und Umweltwissenschaften, Universität Potsdam, Germany;1. Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran;2. Department of Geology, Faculty of Sciences, University of Tehran, Tehran, Iran;3. National Iranian Oil Company (NIOC), Tehran, Iran;4. MAPSA Oil Company, Geology division, Tehran, Iran;1. National Iranian Oil Company Exploration Directorate, Sheikh Bahayi Square, Seoul Street,1994814695, Tehran, Iran;2. Lerchenauerstr. 167, D-80935 München, Germany;1. Karadeniz Technical University, Department of Geological Engineering, TR-61080 Trabzon, Turkey;2. Geological Institute RAS, Pyzevskii per., 7, Moscow, Russia;3. Moscow State University, Geological Faculty, Department of Regional Geology, Vorobievy, Moscow, Russia;1. Dipartimento di Biologia, Ecologia e Scienze della Terra, Università degli Studi della Calabria, Italy;2. Centro di Geologia e Amianto, Agenzia Regionale Protezione Ambiente Calabria, Italy |
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| Abstract: | The Upper Cretaceous shallow-water carbonates of the Pyrenean Basin (NE Spain) host rich and diverse larger foraminiferal associations which witness the recovery of this group of protozoans after the dramatic extinction of the Cenomanian–Turonian boundary interval. In this paper a new, large discoidal porcelaneous foraminifer, Broeckina gassoensis sp. nov., is described from the middle Coniacian shallow-water deposits of the Collada Gassó Formation, in the Bóixols Thrust Sheet. This is the first complex porcelaneous larger foraminifer of the Late Cretaceous global community maturation cycle recorded in the Pyrenean bioprovince. It differs from the late Santonian–early Campanian B. dufrenoyi for its smaller size in A and B generations and the less developed endoskeleton, which shows short septula. Broeckina gassoensis sp. nov. has been widely employed as a stratigraphic marker in the regional geological literature, under the name of “Broeckina”, but its age was so far controversial. Its middle Coniacian age (lowermost part of the Peroniceras tridorsatum ammonite zone), established in this paper by strontium isotope stratigraphy, indicates that it took about 5 My after the Cenomanian–Turonian boundary crisis to re-evolve the complex test architecture of larger foraminifera, which is functional to their relation with photosymbiotic algae and K-strategy. |
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| Keywords: | Larger Foraminifera Biostratigraphy Strontium isotope stratigraphy Coniacian Pyrenees Spain |
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