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.
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