Ostracods of the Cenomanian-Turonian transition in the Ksour and Amour Mountains (Saharan Atlas, Algeria)systematic and palaeobiogeographic implications

  1. Mustapha Benadla
  2. Abbas Marok
  3. Choukri Soulimane
  4. Matías Reolid
Revista:
Estudios geológicos

ISSN: 0367-0449

Año de publicación: 2023

Volumen: 79

Número: 1

Tipo: Artículo

DOI: 10.3989/EGEOL.44880.624 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Estudios geológicos

Objetivos de desarrollo sostenible

Resumen

El estudio de los ostrácodos de la transición Cenomaniense-Turoniense (Cretácico superior) en los Montes Ksour y Monte Amour (Atlas Sahariano, Argelia) ha permitido la identificación de asociaciones fósiles típicas de este periodo caracterizado por cambios ambientales a escala global. La asociacion de ostrácodos consiste en 15 especies y 7 géneros, y se encuentra dominada por la familia Cytherellidae (principalmente el género Cytherella), y en menor medida por las familias Paracyprididae (exclusivamente Paracypris) y Trachyleberididae (principalmente Cythereis). Las formas menos comunes corresponden a las familias Bairdiidae, Bythocypridae y Macrocyprididae. Las asociaciones de ostrácodos del Atlas Sahariano fueron comparadas con las asociaciones de cuencas vecinas pertenecientes a la provincia paleobiogeográfica del Norte de África y Oriente Medio (margen septentrional de Gondwana) con el fin de encontrar similitudes entre cuencas. Así, el resultado obtenido muestra una gran similitud entre la fauna de ostrácodos de las cuencas del Atlas Sahariano en Argelia y Túnez. Por otro lado, existe similaridad entre las asociaciones de las cuencas de Marruecos y Egipto, y de ambas a su vez con las cuencas de Oriente Medio (Jordán y Omán). Finalmente, la fauna de la Cuenca Libanesa aparece relativamente aislada. Estas similaridades entre distintas cuencas desde el punto de vista palaeobiogeográfico pueden evidenciar cierta comunicación entre las mismas o condiciones ambientales equivalentes durante el tránsito Cenomaniense-Turoniense.

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