Writers : Azimi,R.; Seyed-Emami,K.;Sadeghi,A.
Refference : Geosciences Scientific Quarterly Journal,No.:68,P.:16
Publishing Year : 1387

Abstract :

The calpionellid biozonation within Shal and Kolur Formations in Shal region, SE Khalkhal are accomplished based on standard biozonation of Allemann et al. (1977). In this study, 5 biozones are introduced from Tithonian to Hauterivian: biozone.
Biozone 1 belongs to Shal Formation and biozones 2 to 5 to Kolur Formation: 1- Crassicollaria intermedia Taxon Range Zone; Late Tithonian,
2- Calpionella alpina Acme Zone; Early Berriassian,
3- Calpionellopsis simplex-Calpionellites darderi Interval Zone; Late Berriassian to Early Valanginian,
4- Calpionellites darderi-Tintinopsella longa Interval Zone; Valanginian,
5- Tintinopsella longa-Tintinopsella carpathica Interval Zone; Late Valanginian-Hauterivian. Biozone 2 is also subdivided into the Calpionella alpina and Calpionella elliptica Subzones. Biozone 3 is subdivided into the Calpionellopsis simplex and Calpionellopsis oblonga Subzones. Based on this zonation, the Jurassic /Cretaceous boundary (Tithonianl Berriassian) is defined at the Lower boundary of the Calpionella alpina zone which is equivalent to the Shal and Kolour Formation boundary.

Subject List : Calpionellid