Callovian nautiloids from the Neuquén Basin, Argentina
For the first time Callovian nautiloids from the Neuquén Basin (Argentina) are described. All the material was collected with precise stratigraphic control based on the local ammonite successions. Most specimens belong to Cenoceras sp. A from the Lotena Fm at Picún Leufú (Patagoniensis Z., lower U...
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| Autores principales: | , |
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| Formato: | article artículo publishedVersion |
| Lenguaje: | Inglés |
| Publicado: |
Instituto de Fisiografía y Geología. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario
2016
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/2133/6613 http://hdl.handle.net/2133/6613 |
| Aporte de: |
| Sumario: | For the first time Callovian nautiloids from the Neuquén Basin (Argentina) are described. All the
material was collected with precise stratigraphic control based on the local ammonite successions. Most
specimens belong to Cenoceras sp. A from the Lotena Fm at Picún Leufú (Patagoniensis Z., lower Upper
Callovian) and Los Molles Fm at Chacay Melehué (Proximum Z., upper Lower Callovian). Additionally, one
specimen assigned to Cenoceras sp. B comes from the Lotena Fm at Picún Leufú (Patagoniensis Z.). Jurassic
nautiloids are usually scarce all around the world with respect to ammonites, but in the Neuquén Basin they are
very scarce. Our collections of cephalopods have produced some fifteen nautiloids besides more than 5.000
ammonites collected in Late Callovian to Late Tithonian sequences of the Neuquén Basin. This asymmetric
pattern of abundance is surely based, at least in part, on the different reproductive strategies of ammonoids and
nautiloids. |
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