Bioeventos paleoceanográficos en el Cenomaniense de la Cuenca Vasca occidental:: señales micropaleontológicas y geoquímicas.

• Autores: Julio M. Rodríguez Lázaro, José Javier Elorza Zandueta, Francisco García Garmilla, Ernesto García Zárraga, Ana Pascual Cuevas
• Localización: Geogaceta, ISSN 0213-683X, Nº. 19, 1995, págs. 76-80
• Idioma: español
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• Resumen

  • Detailed micropaleontologic and isotopic data from the Cenomanian of the Leioa section (Basque Basin, Northern Spain) show the existence of four bioevents, one located in the lower Cenomanian (R. brotzeni biozone) two in the middle Cenomanian (Rotalipora reicheli biozone; base of R. cushmani biozone) and the fourth in the middle-upper Cenomanian boundary (R. cushmani biozone). Each bioevent is defined by drastic changes in the microfaune dynamics (planktonic and benthonic foraminifers and ostracodes) as well as by the isotopic signals o f