Middle Triassic conodonts from northeastern Spain: biostratigraphic implications |
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| Authors: | A Márquez-Aliaga JI Valenzuela-Ríos F Calvet & K Budurov |
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| Affiliation: | Instituto Cavanilles de Biodiversidad y Biología Evolutiva, and, Departamento de Geología, Universitat de València, c/. Dr Moliner 50, 46100 Burjassot (València), Spain,;Departamento de Geología, Universitat de València, c/. Dr Moliner 50, 46100 Burjassot (València), Spain,;Departamento de G.P.P.G. Facultad de Geología, Universitat de Barcelona, Zona de Pedralbes, 08071 Barcelona, Spain,;Geological Institute, Academy of Sciences, Acad. G. Bouchev Str. Bl. 24, 1113 Sofia, Bulgaria |
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| Abstract: | The facies development of the Spanish Triassic corresponds to the typical three-fold subdivision of the Germanic Facies: Buntsandstein, Muschelkalk and Keuper. Two intervals interpreted as epeiric carbonate platforms: lower Muschelkalk (Anisian) and upper Muschelkalk (Ladinian) are recognized during the Middle Triassic of northeastern Spain. These carbonate intervals are separated by one siliciclastic/evaporitic interval interpreted as sabbkha and saline deposits: middle Muschelkalk facies (Lower Ladinian). In northeastern Spain (Catalonian Coastal Ranges), two Middle Triassic sections comprising lower Muschelkalk facies have yielded the following conodont taxa: Paragondolella bulgarica, P. hanbulogi, P. bifurcata, Neogondolella constricta, N. cornuta, N. excentrica and N. basisymmetrica . The conodont sequence allows recognition of the P. bulgarica and N. constricta zones. These results indicate a middle–upper Pelsonian to upper Illyrian age (middle–upper Anisian), and represent the first conodont-chronostratigraphic approximation for the lower Muschelkalk facies of the western part of the Sephardic Province of the Triassic Tethys Realm. |
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