Bioestratigrafía con foraminíferos planctónicos del límite Ypresiense/Luteciense de Fortuna (Cordilleras Béticas, España)

• C. Gonzalvo ^[1] ; E. Molina ^[1]
  1. [1] Universidad de Zaragoza

     Universidad de Zaragoza

     Zaragoza, España

     
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 5, 2003 (Ejemplar dedicado a: V Congreso del Grupo Español del Terciario (Granada, 23-25 de septiembre, 2003)), págs. 113-116
• Idioma: inglés
• Enlaces
  • Texto Completo Ejemplar
• Resumen

  • The Fortuna section has been studied to assess its suitability as a Global Stratotype Section and Point (GSSP) for the Early/Middle Eocene (Ypresian/Lutetian) Boundary. The planktic foraminiferal biostratigraphic study provided a biozonation divided in subzones: Acarinina pentacamerata Biozone, with Subbotina boweri Subzone and Truncorotaloides praetopilensis Subzone (Ypresian, Early Eocene), Hantkenina nuttalli Biozone, with Hantkenina nuttalli Subzone and Globigerapsis subconglobata Subzone, and Globigerapsis kugleri Biozone (Lutetian, Middle Eocene). Across the Early/Middle Eocene boundary a progressive assemblage change occurred since 10 species gradually disappeared and 19 appeared. The diversity increased greatly at the base of the Middle Eoeene. The first occurrence of Hantkenina nuttalli seems to be a good marker for the Ypresian/Lutetian (Early/Middle Eocene) boundary.