New Valanginian–Hauterivian neocomitid ammonites from the Neuquén Basin, Argentina

Three distinct, rich neocomitid faunas occur in the Agrio Formation (middle Valanginian to lowermost Barremian). In the ammonite sequences between, neocomitids are very rare and limited to two thin horizons. The lower, upper Valanginian level has yielded Neocomites (Varlheideites) cf. peregrinus Raw...

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Detalles Bibliográficos
Autores principales: Aguirre-Urreta, B., Rawson, P.F.
Formato: JOUR
Materias:
Agrio Formation
Ammonite
Andes
Early Cretaceous
Paleogeography
ammonite
Cretaceous
endemic species
new species
new taxon
paleogeography
Ammonoidea
Neocomitidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01956671_v88_n_p149_AguirreUrreta
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Three distinct, rich neocomitid faunas occur in the Agrio Formation (middle Valanginian to lowermost Barremian). In the ammonite sequences between, neocomitids are very rare and limited to two thin horizons. The lower, upper Valanginian level has yielded Neocomites (Varlheideites) cf. peregrinus Rawson and Kemper, Neocomites (Varlheideites) sp. nov.? and Rodighieroites sp. which are widely distributed taxa. The upper level contains Comahueites aequalicostatus gen. et sp. nov., which appears endemic to the basin. © 2017 Elsevier Ltd

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