Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications
Detailed paleontological studies of the basal strata of the La Peña Formation from a stratigraphic section of the State of Nuevo León, northeastern Mexico, reveal a rich ammonite assemblage representative of the local biozone indicative of the uppermost level of the early Aptian corresponding to th...
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Universidad Nacional Autónoma de México
2018-01-01
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| Series: | Revista Mexicana de Ciencias Geológicas |
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| Online Access: | https://rmcg.unam.mx/index.php/rmcg/article/view/677 |
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| author | Ricardo Barragán Florentin J-M. R. Maurrasse |
| author_facet | Ricardo Barragán Florentin J-M. R. Maurrasse |
| author_sort | Ricardo Barragán |
| collection | DOAJ |
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Detailed paleontological studies of the basal strata of the La Peña Formation from a stratigraphic section of the State of Nuevo León, northeastern Mexico, reveal a rich ammonite assemblage representative of the local biozone indicative of the uppermost level of the early Aptian corresponding to the Dufrenoyia justinae Taxon Range Zone. The Lower Aptian assignment of this Mexican biozone is corroborated by its distinctive ammonite assemblage characteristic of both uppermost early Aptian standard ammonite zones of the stage; namely the Dufrenoyia furcata Zone, of the tripartite Mediterranean standard scheme, and its equivalent Tropaeum bowerbankii Zone of the northeastern Europe bipartite scheme. Thus, in Mexico, the shift of deposition from a shallow carbonate platform locally represented by facies of the Cupido Formation, to the deeper facies of the La Peña Formation took place sometime during the late early Aptian and not in the late Aptian as previously assigned. To avoid diachronic interpretations of the Cupido-La Peña formational contact, the ammonites analyzed in this study for biochronostratigraphic purposes, were compared to other coeval assemblages reported from the basal strata of the La Peña Formation on a regional scale.
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| format | Article |
| id | doaj-art-ecc108ae3faf4bfcb4bac5cb241f7549 |
| institution | Kabale University |
| issn | 1026-8774 2007-2902 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Universidad Nacional Autónoma de México |
| record_format | Article |
| series | Revista Mexicana de Ciencias Geológicas |
| spelling | doaj-art-ecc108ae3faf4bfcb4bac5cb241f75492025-08-20T03:44:51ZengUniversidad Nacional Autónoma de MéxicoRevista Mexicana de Ciencias Geológicas1026-87742007-29022018-01-01251Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implicationsRicardo Barragán0Florentin J-M. R. Maurrasse1Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, 04510 México D. F., Mexico.Department of Earth Sciences, Florida International University, University Park Campus, Miami, Florida, 33199, U. S. A. Detailed paleontological studies of the basal strata of the La Peña Formation from a stratigraphic section of the State of Nuevo León, northeastern Mexico, reveal a rich ammonite assemblage representative of the local biozone indicative of the uppermost level of the early Aptian corresponding to the Dufrenoyia justinae Taxon Range Zone. The Lower Aptian assignment of this Mexican biozone is corroborated by its distinctive ammonite assemblage characteristic of both uppermost early Aptian standard ammonite zones of the stage; namely the Dufrenoyia furcata Zone, of the tripartite Mediterranean standard scheme, and its equivalent Tropaeum bowerbankii Zone of the northeastern Europe bipartite scheme. Thus, in Mexico, the shift of deposition from a shallow carbonate platform locally represented by facies of the Cupido Formation, to the deeper facies of the La Peña Formation took place sometime during the late early Aptian and not in the late Aptian as previously assigned. To avoid diachronic interpretations of the Cupido-La Peña formational contact, the ammonites analyzed in this study for biochronostratigraphic purposes, were compared to other coeval assemblages reported from the basal strata of the La Peña Formation on a regional scale. https://rmcg.unam.mx/index.php/rmcg/article/view/677AmmonitesLower Cretaceousearly AptianLa Peña FormationMexico. |
| spellingShingle | Ricardo Barragán Florentin J-M. R. Maurrasse Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications Revista Mexicana de Ciencias Geológicas Ammonites Lower Cretaceous early Aptian La Peña Formation Mexico. |
| title | Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications |
| title_full | Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications |
| title_fullStr | Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications |
| title_full_unstemmed | Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications |
| title_short | Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications |
| title_sort | lower aptian lower cretaceous ammonites from the basal strata of the la pena formation of nuevo leon state northeast mexico biochronostratigraphic implications |
| topic | Ammonites Lower Cretaceous early Aptian La Peña Formation Mexico. |
| url | https://rmcg.unam.mx/index.php/rmcg/article/view/677 |
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