Abstract
Geological events are of paramount importance in solving correlation and chronostratigraphic problems. Nevertheless, unequivocal definitions for the various event patterns and also for the “event ”concept itself are lacking. Event names do not help either to clarify its nature. Identification through lithostratigraphic terms, corresponding to settings and units where the events develop better, is proposed here. The remarkable vagueness in definition of the Kacak-otomari event is discussed. In the Palentine Domain the event is best characterized between the Pinacites extinction, in a black shale succession, and an important ammonoid radiation (mainly of Cabrieroceras spp., and Sobolewia) recorded in the Man Mb. limestones. This event corresponds there to a nearly complete T-R cycle. The appearance of the suborder Tornoceratina, usually coupled with the Kacak-otomari event, occurs in Palencia in a later transgressive pulse; this would indicate that it is a different bio-event with a great potential value as a stratigraphic boundary or correlation tool.
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Truyóls-Massoni, M., Montesinos, R., Garcia-Alcalde, J.L., Leyva, F. (1990). The Kacak-otomari event and its characterization in the Palentine domain (Cantabrian Zone, NW Spain). In: Kauffman, E.G., Walliser, O.H. (eds) Extinction Events in Earth History. Lecture Notes in Earth Sciences, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0011141
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DOI: https://doi.org/10.1007/BFb0011141
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