Lower Cretaceous ammonites from the Neuquén Basin, Argentina: the neocomitids of the Pseudofavrella angulatiformis Zone (upper Valanginian)

The Pseudofavrella angulatiformis Zone (upper Valanginian) of the Agrio Formation in the Neuquén Basin, Argentina, is characterized exclusively by a complex sequence of neocomitid faunas that are sandwiched between the olcostephanids of the underlying Viluceras permolestus Subzone beneath and the ho...

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Bibliographic Details
Published inCretaceous research Vol. 31; no. 3; pp. 321 - 343
Main Authors Aguirre-Urreta, Maria B., Rawson, Peter F.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2010
Subjects
Ammonites
Argentina
Lower Cretaceous
Neocomitidae
Neuquén Basin
Upper Valanginian
Ammonites
Argentina
Upper Valanginian
Neuquén Basin
Lower Cretaceous
Neocomitidae
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Summary:The Pseudofavrella angulatiformis Zone (upper Valanginian) of the Agrio Formation in the Neuquén Basin, Argentina, is characterized exclusively by a complex sequence of neocomitid faunas that are sandwiched between the olcostephanids of the underlying Viluceras permolestus Subzone beneath and the holcodiscid faunas of the Holcoptychites neuquensis Zone above (lowermost Hauterivian). Three successive neocomitid genera, Pseudofavrella, Chacantuceras and Decliveites gen. nov., characterize three subzones. Over half the taxa are new: Pseudofavrella robusta, P. sp. nov. 1 and 2, Chacantuceras casanuestraense, Chacantuceras coniunctum, Decliveites crassicostatus, and Decliveites agrioensis.
ISSN:0195-6671
1095-998X
DOI:10.1016/j.cretres.2010.01.002