The Norian-Rhaetian boundary in the light of micropaleontological data


  • Andrzej Gaźdicki
  • Heinz Kozur
  • Rudolf Mock


The stratigraphic ranges of Late Triassic conodonts, holothurian sclerites, ostracodes, and foraminifers are studied in representative sections of the uppermost Triassic of the Western Carpathians and Eastern Alps. The zonal subdivisions based on the above mentioned microfossils could be correlated with the ammonoid zonation and the stratigraphic scheme proposed by Kozur (1973b). The definition of the Norian-Rhaetian boundary with the base of the Choristoceras haueri zone agrees with the priority. This boundary is supported by distinct changes in animal and plant groups. The typical Kössen Beds appear to be of Rhaetian age, contemporaneous with the Zlambach Beds, and only the lowermost parts of these two units represent (Zlambach Beds) or at some places represent (Kössen Beds) the uppermost Norian (upper Sevatian). In the systematic part a new foraminifer species, »Vidalina« carpathica Gaździcki, n. sp. is described.


How to Cite

Gaźdicki, A., Kozur, H., & Mock, R. (1979). The Norian-Rhaetian boundary in the light of micropaleontological data. Geologija, 22(1), 71–111. Retrieved from