Record of Carcharocles megalodon in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

  1. Reolid, M. 1
  2. Molina, J. M. 1
  1. 1 Departamento de Geología, Universidad de Jaén
Revista:
Estudios geológicos

ISSN: 0367-0449

Año de publicación: 2015

Volumen: 71

Número: 2

Tipo: Artículo

DOI: 10.3989/EGEOL.41828.342 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Estudios geológicos

Objetivos de desarrollo sostenible

Resumen

Tortonian diatomites of the San Felix Quarry (Porcuna), in the Eastern Guadalquivir Basin, have given isolated marine vertebrate remains that include a large shark tooth (123.96 mm from apex to the baseline of the root). The large size of the crown height (92.2 mm), the triangular shape, the broad serrated crown, the convex lingual face and flat labial face, and the robust, thick angled root determine that this specimen corresponds to Carcharocles megalodon. The symmetry with low slant shows it to be an upper anterior tooth. The total length estimated from the tooth crown height is calculated by means of different methods, and comparison is made with Carcharodon carcharias. The final inferred total length of around 11 m classifies this specimen in the upper size range of the known C. megalodon specimens. The palaeogeography of the Guadalquivir Basin close to the North Betic Strait, which connected the Atlantic Ocean to the Mediterranean Sea, favoured the interaction of the cold nutrient-rich Atlantic waters with warmer Mediterranean waters. The presence of diatomites indicates potential upwelling currents in this context, as well as high productivity favouring the presence of large vertebrates such as mysticetid whales, pinnipeds and small sharks (Isurus). These large vertebrates recorded in the Eastern Guadalquivir Basin were potential prey of C. megalodon.

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