Upper Cenomanian and lower Turonian (Cretaceous) corals from the Tethyan West Portuguese Carbonate Platform
Por:
Loser, Hannes, Callapez, Pedro M.
Publicada:
1 jun 2022
Resumen:
Scleractinian corals of late Cenomanian to early Turonian age from the
western border of the Iberian Peninsula are described for the first
time. They derive from middle to inner shelf limestones of the mid
Albian-Turonian West Portuguese Carbonate Platform, near the localities
of Figueira da Foz, Leiria, and Nazare, where a succession of
fossil-rich beds with cephalopods, rudists, and other invertebrates
allows an accurate biostratigraphic control from the basal upper
Cenomanian to the upper lower Turonian. During this interval, facies are
deeper and carbonate-rich, that are more favourable to the occurrence of
hermatypic corals and which are absent in previous sequences of the
platform. The studied corals belong to the superfamilies
Actinastreoidea, Cladocoroidea, Cyclolitoidea, Madreporoidea,
Phyllosmilioidea, and Poritoidea. With a total of 11 species, the number
of taxa is comparatively low when compared with other Late Cretaceous
faunas. The corals show relationships to Albian coral faunas from the SE
Iberian Platform and the Quillan Basin (SW France), both of which are
located in the Tethyan Realm. The faunal turnover in scleractinian
corals at the Cenomanian/Turonian (C/T) boundary is discussed.
Scleractinian corals were rich in genera during the Cenomanian and reach
about 110 co-existing genera at the base of the late Cenomanian. This
number was reduced by 46 genera that became extinct at the
Cenomanian/Turonian boundary, but were replaced rapidly after the
boundary by 59 genera, of which six became extinct before the Coniacian.
Sixty-six genera survived the C/T boundary, of which 11 became extinct
before the middle Coniacian. This means that the Cenomanian richness in
genera was almost restored in the Coniacian.
Filiaciones:
Loser, Hannes:
Univ Nacl Autonoma Mexico, Inst Geol, Estn Reg Noroeste, LD Colosio & Madrid S-N, Hermosillo 83200, Sonora, Mexico
Callapez, Pedro M.:
Univ Coimbra, CITEUC Ctr Earth & Space Res, Fac Sci & Technol, Earth Sci Dept, Polo 2,Rua Silvio Lima, P-3030790 Coimbra, Portugal
|