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Journal of Iberian Geology

, Volume 43, Issue 1, pp 61–73 | Cite as

An interesting orbitolinid assemblage from the early Albian of Cantabria (N Spain)

  • F. Schlagintweit
  • I. Rosales
  • M. Najarro
Research Article
  • 257 Downloads

Abstract

Purpose

An outcrop of early Cretaceous shallow water carbonates, partly rich in corals, is exposed in the Sorrozuela site, along the coast line of the Ajo Cape peninsula, Cantabria. The purpose of this work is to study the orbitolinid assemblage of these platform carbonates, which have been attributed to the Ramales Formation.

Methods

For that, rock samples were collected and thin-section were analyzed from the Albian limestones of the Ajo Cape area (Sorrozuela site).

Results

Thin-section analysis yielded an interesting assemblage of orbitolinids including (in decreasing abundances Simplorbitolina manasi Ciry and Rat, Orbitolinopsis ajoensis n. sp., Dictyoconus? tunesianus (Peybernès), Simplorbitolina conulus Schroeder, and Palaeodictyoconus sp., indicating a late early Albian age. D.? tunesianus is recorded for the first time from Cantabria, representing also the youngest occurrence known so far. Orbitolinopsis ajoensis n. sp. is characterized by its medium-conical test, a subdivided marginal zone, and rather small, close-set cupules in the central zone. The new species represents one of the youngest lower Cretaceous records of the genus.

Conclusions

The new data provide further details on the biostratigraphic use of orbitolinid foraminifera in the Cantabrian Urgonian (Aptian-Albian) system.

Keywords

Urgonian Orbitolinidae Systematics Biostratigraphy Basque Cantabrian Basin 

Resumen

Objetivo

Se ha estudiado un afloramiento de carbonatos de plataforma somera, parcialmente ricos en corales, que afloran en la localidad de Sorrozuela a lo largo de la costa del Cabo de Ajo, Cantabria. El objetivo de este estudio es analizar la asociación de orbitolínidos de estas calizas de plataforma atribuidas a la Formación Ramales.

Métodos

Para ello, se han recogido muestras y se han estudiado láminas delgadas de las calizas albienses del área de Cabo de Ajo (localidad de Sorrozuela).

Resultados

El análisis de láminas delgadas ha arrojado una asociación interesante de orbitolínidos que incluye (en orden decreciente de abundancia) Simplorbitolina manasi Ciry and Rat, Orbitoliniopsis ajoensis n. sp., Dictyoconus? tunesianus (Peybernès), Simplorbitolina conulus Schroeder y Palaeodictyoconus sp., indicando una edad de parte alta del Albiense inferior. Se registra D.? tunesianus por primera vez en Cantabria, representando además la aparición más moderna conocida hasta ahora. Orbitolinopsis ajoensis n. sp. está caracterizada por su caparazón cónico mediano, una zona marginal subdividida y cúpulas muy juntas y bastante pequeñas en las zona central. Esta nueva especie representa uno de los registros más modernos del género para el Cretácico inferior.

Conclusiones

Estos nuevos datos aportan detalles adicionales en el uso bioestratigráfico de los orbitolínidos para el estudio del sistema Urgoniano (Aptiense-Albiense) cantábrico.

Palabras clave

Urgoniano Orbitolinidae Sistemática Bioestratigrafía Cuenca Vasco-Cantábrica 

Notes

Acknowledgements

This is a contribution to the research project CGL2014-53548-P, funded by the Ministerio de Economía y Competitividad (MINECO) of Spain. The authors thank the experts reviews of Dr. Kai-Uwe Graefe and an anonymous reviewer, and the support provided by the Editor Javier Martín-Chivelet.

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.MunichGermany
  2. 2.Instituto Geológico y Minero de España (IGME)MadridSpain

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