Lower Ordovician (Floian) conodonts from the Western Puna Magmatic Belt in northwestern Argentina: palaeobiogeographic significance and implications
Voldman GG, Vaccari NE, Cañas FL, Lo Valvo GA, Lehnert O, Waisfeld BG (2026)
Publication Type: Journal article
Publication year: 2026
Journal
Book Volume: 12
Article Number: e70074
Journal Issue: 2
DOI: 10.1002/spp2.70074
Abstract
The arc-derived volcaniclastic rocks of the Aguada de la Perdiz Formation, exposed in the Vega Pinato section, yielded the first Floian conodont fauna identified in the Western Puna Magmatic Belt, northwestern Argentina. Despite the presence of fractures, the conodont elements are sufficiently preserved for taxonomic identification. The assemblage, comprising 380 elements, is notably diverse and includes Acanthodus lineatus, Acodus sp., Aloxoconus aff. staufferi, Bergstroemognathus extensus, B. robustus, Colaptoconus quadraplicatus, Diaphorodus cf. delicatus, Drepanodus arcuatus, Drepanodus? sp., Drepanoistodus pitjanti, D. aff. pitjanti, D. cf. basiovalis, Gothodus andinus, Juanognathus jaanusoni, J. variabilis, Oelandodus? sp., Oneotodus costatus, Paroistodus sp., Periodon flabellum, Pohlerodus heligma, Protopanderodus gradatus, Pr. leonardii, Reutterodus andinus, Rhipidognathus sp., Scalpellodus cf. striatus, S. cf. tersus, Scolopodus striatus, Scolopodus sp., Tropodus australis, Zentagnathus cf. argentinensis, and gen. et sp. A. Dated to the middle–late Floian, this conodont assemblage includes several typical warm water taxa; this is unusual compared with contemporaneous faunas from the nearby Cordillera Oriental, and instead has stronger palaeobiogeographical affinities with the Famatinian arc. Additionally, the presence of elements commonly associated with Australasia, China, Laurentia and the Argentine Precordillera suggests an active faunal dispersal across the Iapetus Ocean during the Early Ordovician, connecting palaeoequatorial settings to the volcanic environments developed along the southwestern margin of Gondwana.
Authors with CRIS profile
Involved external institutions
Universidad Nacional de Córdoba
Argentina (AR)
National University of Río Cuarto / Universidad Nacional de Río Cuarto (UNRC)
Argentina (AR)
Argentina (AR)
National University of Río Cuarto / Universidad Nacional de Río Cuarto (UNRC)
Argentina (AR)
How to cite
APA:
Voldman, G.G., Vaccari, N.E., Cañas, F.L., Lo Valvo, G.A., Lehnert, O., & Waisfeld, B.G. (2026). Lower Ordovician (Floian) conodonts from the Western Puna Magmatic Belt in northwestern Argentina: palaeobiogeographic significance and implications. Papers in Palaeontology, 12(2). https://doi.org/10.1002/spp2.70074
MLA:
Voldman, Gustavo G., et al. "Lower Ordovician (Floian) conodonts from the Western Puna Magmatic Belt in northwestern Argentina: palaeobiogeographic significance and implications." Papers in Palaeontology 12.2 (2026).
BibTeX: Download