Distribution of chitinozoans in the Llandovery of the Oslo region

Llandovery chitinozoans of the Oslo region are identified and discussed. The species ranges in nine sections are illustrated. The distribution of chitinozoans in all studied formations of the Oslo region is documented, with establishment of a succession of nine chitinozoan biozones, named as follows: Ancyrochitina laevaensis, Belonechitina postrobusta, Conochitina electa, Spinachitina maennili, Conochitina alargada, Eisenackitina dolioliformis, Angochitina longicollis, Conochitina proboscifera, and Margachitina margaritana (continuing in the lower Wenlock).