Les zones et sous-zones ammonitiques dans lʼétage Barrémien en Bulgarie du Nord-Est

S. Breskovski. Ammonite Zones and Subzones of the Barremian in Northeastern Bulgaria. The succession of ammonite fauna in 96 sections of the Barremian in Northeast Bulgaria suggests the subdivision of two ammonite zones and four subzones:
       Upper Barremian:
          2. Pseudosaynella strettostoma zone
               b. Matheronites soulieri subzone
               a. Barremites cassidoides subzone
       Lower Barremian
          1. Crioceratites emerici zone
               b. Holcodiscus perezianus subzone
               a. Pseudothurmannia pseudomalbosi subzone
For each established (sub)zonal subdivision, data for the index type and nomenclature are given. Argumentation of the boundaries is made. The genera and species established in each (sub)zone are subdivided into three groups: (I) Typical for the subdivision; (2) Present in the given subdivision but occurring also below its lower boundary; (3) Present in the given subdivision but occurring also above its upper boundary. The success ions studied are shown on the applied figures in which all established taxons of the generic and species group of the Barremian in Northeastern Bulgaria are included.