Resumen de EI límite Dogger-Malm en la Cordillera Ibérica: anomalías geóquímicas y fenómenos asociados

Guillermo Meléndez Hevia, Leandro Sequeiros San Román, W. Brochwicz-Lewiñski, T. A. Gasiewicz, S. Suffzynsky, K. Szatkowski, M. Zbik, R. Tarkowski

• The hypothesis put forward by Raup and Sepkoski, linking major mass extintions with cyclic cosmic catastrophes, focussed attention on several geological boundaries. This was also the case of the Middle/ Upper Jurassic boundary in Poland and Spain (lberian Chain).

  Sorne 11rare events>> have been detected: possible submarine corrosion processes, lranomal y and high enrichment in heavy metals (Fe, Mn, Ni, Co, Ra and Pt), cosmic dust, etc.