The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
Myophorellid bivalves (Trigonioida, Myophorellacea) with conspicuously tuberculate shells are abundant in Lower Cretaceous rocks of the Neuquén Basin represented by the Gondwanian genus Steinmanella Crickmay, 1930. Publications concerning Neuquén trigonioids deal only with taxonomy, and until now th...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223360_v77_n6_p1069_Lazo http://hdl.handle.net/20.500.12110/paper_00223360_v77_n6_p1069_Lazo |
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paper:paper_00223360_v77_n6_p1069_Lazo2023-06-08T14:49:44Z The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina biostratigraphy bivalve Cretaceous morphology paleobiology taxonomy Argentina Neuquen Basin South America Bivalvia Bivalvia Holcoptychites neuquensis Hoplitocrioceras gentilii Invertebrata Pseudofavrella angulatiformis Steinmanella Steinmanella pehuenmapuensis Steinmanella transitoria Trigonioida Trigonioida Trigonioidea Weavericeras vacaensis Myophorellid bivalves (Trigonioida, Myophorellacea) with conspicuously tuberculate shells are abundant in Lower Cretaceous rocks of the Neuquén Basin represented by the Gondwanian genus Steinmanella Crickmay, 1930. Publications concerning Neuquén trigonioids deal only with taxonomy, and until now the sedimentary environments of the Steinmanella bearing facies have not been interpreted. The present study analyzes morphology, taxonomy, stratigraphy, and paleobiology of Steinmanella species collected from five sections of the Lower Member of the Agrio Formation, including the type locality. Two species are differentiated: Steinmanella pehuenmapuensis (Leanza, 1998) from the lower part of the member (Pseudofavrella angulatiformis Zone) and Steinmanella transitoria (Steinmann, 1881) from the middle and upper part of the member (Holcoptychites neuquensis, Hoplitocrioceras gentilii, and Weavericeras vacaensis Zones). Specimens of both species have been recorded in intermediate to high-energy shoreface and low-energy offshore deposits. The inferred paleoecologic model is that Steinmanella lived semi-infaunally and burrowed on sandy substrates in the shoreface and on muddy substrates in the offshore. Colonization of low-energy subenvironments in the offshore probably occurred during increased sea-floor oxygenation and reduced net sedimentation or brief omission periods. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223360_v77_n6_p1069_Lazo http://hdl.handle.net/20.500.12110/paper_00223360_v77_n6_p1069_Lazo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
biostratigraphy bivalve Cretaceous morphology paleobiology taxonomy Argentina Neuquen Basin South America Bivalvia Bivalvia Holcoptychites neuquensis Hoplitocrioceras gentilii Invertebrata Pseudofavrella angulatiformis Steinmanella Steinmanella pehuenmapuensis Steinmanella transitoria Trigonioida Trigonioida Trigonioidea Weavericeras vacaensis |
| spellingShingle |
biostratigraphy bivalve Cretaceous morphology paleobiology taxonomy Argentina Neuquen Basin South America Bivalvia Bivalvia Holcoptychites neuquensis Hoplitocrioceras gentilii Invertebrata Pseudofavrella angulatiformis Steinmanella Steinmanella pehuenmapuensis Steinmanella transitoria Trigonioida Trigonioida Trigonioidea Weavericeras vacaensis The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina |
| topic_facet |
biostratigraphy bivalve Cretaceous morphology paleobiology taxonomy Argentina Neuquen Basin South America Bivalvia Bivalvia Holcoptychites neuquensis Hoplitocrioceras gentilii Invertebrata Pseudofavrella angulatiformis Steinmanella Steinmanella pehuenmapuensis Steinmanella transitoria Trigonioida Trigonioida Trigonioidea Weavericeras vacaensis |
| description |
Myophorellid bivalves (Trigonioida, Myophorellacea) with conspicuously tuberculate shells are abundant in Lower Cretaceous rocks of the Neuquén Basin represented by the Gondwanian genus Steinmanella Crickmay, 1930. Publications concerning Neuquén trigonioids deal only with taxonomy, and until now the sedimentary environments of the Steinmanella bearing facies have not been interpreted. The present study analyzes morphology, taxonomy, stratigraphy, and paleobiology of Steinmanella species collected from five sections of the Lower Member of the Agrio Formation, including the type locality. Two species are differentiated: Steinmanella pehuenmapuensis (Leanza, 1998) from the lower part of the member (Pseudofavrella angulatiformis Zone) and Steinmanella transitoria (Steinmann, 1881) from the middle and upper part of the member (Holcoptychites neuquensis, Hoplitocrioceras gentilii, and Weavericeras vacaensis Zones). Specimens of both species have been recorded in intermediate to high-energy shoreface and low-energy offshore deposits. The inferred paleoecologic model is that Steinmanella lived semi-infaunally and burrowed on sandy substrates in the shoreface and on muddy substrates in the offshore. Colonization of low-energy subenvironments in the offshore probably occurred during increased sea-floor oxygenation and reduced net sedimentation or brief omission periods. |
| title |
The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina |
| title_short |
The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina |
| title_full |
The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina |
| title_fullStr |
The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina |
| title_full_unstemmed |
The Genus Steinmanella (Bivalvia, Trigonioida) in the Lower Member of the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina |
| title_sort |
genus steinmanella (bivalvia, trigonioida) in the lower member of the agrio formation (lower cretaceous), neuquén basin, argentina |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223360_v77_n6_p1069_Lazo http://hdl.handle.net/20.500.12110/paper_00223360_v77_n6_p1069_Lazo |
| _version_ |
1768543311402893312 |