New Valanginian–Hauterivian neocomitid ammonites from the Neuquén Basin, Argentina. (August 2018)

• Record Type: Journal Article
• Authors: Aguirre-Urreta, Beatriz; Rawson, Peter F.
• Is Part Of: Cretaceous research. Volume 88(2018)
• Page Start: 149
• Page End: 157
• Publication Date: 2018-08
• Subjects: Ammonite -- Andes -- Early Cretaceous -- Agrio Formation -- Paleogeography; Geology, Stratigraphic -- Cretaceous -- Periodicals; 551.77
• DOI: 10.1016/j.cretres.2017.03.017
• Languages: English
• ISSNs: 0195-6671

Abstract

Abstract: 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. Highlights: Neocomites ( Varlheideites ) and Rodighieroites first records from the Neuquén Basin. Widespread distribution of neocomitids of the Mediterranean peregrinus subzone. Comahueites, a new Hauterivian endemic neocomitid genus in the Neuquén Basin.