Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna
The olcostephanid fauna of the Olcostephanus (O.) laticosta [formerly O. (O.) leanzai] Subzone (Agrio Formation) represents the last of four discrete invasions of olcostephanid ammonites into the Neuquén Basin of west-central Argentina. Olcostephanus (O.) laticosta (Gerth) dominates the fauna and is...
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2001
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v22_n6_p763_AguirreUrreta http://hdl.handle.net/20.500.12110/paper_01956671_v22_n6_p763_AguirreUrreta |
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paper:paper_01956671_v22_n6_p763_AguirreUrreta |
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paper:paper_01956671_v22_n6_p763_AguirreUrreta2023-06-08T15:20:08Z Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna Ammonites Argentina Biostratigraphy Lower cretaceous Lower Hauterivian Neuquén basin Olcostephanidae ammonite biostratigraphy Cretaceous Hauterivian lithostratigraphy morphology Argentina Neuquen Basin Ammonoidea Ammonoidea Hoplitocrioceras giovinei Invertebrata Jeannoticeras Olcostephanidae Olcostephanus laticosta Olcostephanus variegatus The olcostephanid fauna of the Olcostephanus (O.) laticosta [formerly O. (O.) leanzai] Subzone (Agrio Formation) represents the last of four discrete invasions of olcostephanid ammonites into the Neuquén Basin of west-central Argentina. Olcostephanus (O.) laticosta (Gerth) dominates the fauna and is known only from the Neuquén Basin. But the co-occurrence of the distinctive subgenus Feannoticeras, newly recorded from Argentina, provides a link with the 'standard' West Mediterranean sequence and indicates that the O. (O.) laticosta Subzone is probably of mid Early Hauterivian age. This is supported by the discovery of two specimens of the widely distributed late Early Hauterivian species O. (O.) variegatus (Paquier) in the overlying Hoplitocrioceras giovinei Subzone. O. (Jeannoticeras) agrioensis sp. nov. is described. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v22_n6_p763_AguirreUrreta http://hdl.handle.net/20.500.12110/paper_01956671_v22_n6_p763_AguirreUrreta |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Ammonites Argentina Biostratigraphy Lower cretaceous Lower Hauterivian Neuquén basin Olcostephanidae ammonite biostratigraphy Cretaceous Hauterivian lithostratigraphy morphology Argentina Neuquen Basin Ammonoidea Ammonoidea Hoplitocrioceras giovinei Invertebrata Jeannoticeras Olcostephanidae Olcostephanus laticosta Olcostephanus variegatus |
| spellingShingle |
Ammonites Argentina Biostratigraphy Lower cretaceous Lower Hauterivian Neuquén basin Olcostephanidae ammonite biostratigraphy Cretaceous Hauterivian lithostratigraphy morphology Argentina Neuquen Basin Ammonoidea Ammonoidea Hoplitocrioceras giovinei Invertebrata Jeannoticeras Olcostephanidae Olcostephanus laticosta Olcostephanus variegatus Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna |
| topic_facet |
Ammonites Argentina Biostratigraphy Lower cretaceous Lower Hauterivian Neuquén basin Olcostephanidae ammonite biostratigraphy Cretaceous Hauterivian lithostratigraphy morphology Argentina Neuquen Basin Ammonoidea Ammonoidea Hoplitocrioceras giovinei Invertebrata Jeannoticeras Olcostephanidae Olcostephanus laticosta Olcostephanus variegatus |
| description |
The olcostephanid fauna of the Olcostephanus (O.) laticosta [formerly O. (O.) leanzai] Subzone (Agrio Formation) represents the last of four discrete invasions of olcostephanid ammonites into the Neuquén Basin of west-central Argentina. Olcostephanus (O.) laticosta (Gerth) dominates the fauna and is known only from the Neuquén Basin. But the co-occurrence of the distinctive subgenus Feannoticeras, newly recorded from Argentina, provides a link with the 'standard' West Mediterranean sequence and indicates that the O. (O.) laticosta Subzone is probably of mid Early Hauterivian age. This is supported by the discovery of two specimens of the widely distributed late Early Hauterivian species O. (O.) variegatus (Paquier) in the overlying Hoplitocrioceras giovinei Subzone. O. (Jeannoticeras) agrioensis sp. nov. is described. |
| title |
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna |
| title_short |
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna |
| title_full |
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna |
| title_fullStr |
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna |
| title_full_unstemmed |
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna |
| title_sort |
lower cretaceous ammonites from the neuquén basin, argentina: a hauterivian olcostephanus fauna |
| publishDate |
2001 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v22_n6_p763_AguirreUrreta http://hdl.handle.net/20.500.12110/paper_01956671_v22_n6_p763_AguirreUrreta |
| _version_ |
1768542456090984448 |