A provisional global biozonation of Devonian chitinozoans is proposed. The whole system is subdivided into nineteen biostratigraphic subdivisions with eighteen interval range biozones and the last one corresponding to a total range biozone as the group became extinct at the very end of the Famennian. According the rationale we adopted, the selected index species must be widespread (at least represented on two palaeocontinents or to have remote occurrences on the largest palaeocontinents). However, the lack of suitable taxa for some periods necessitated leaving two time intervals without formal zonation. The total range of the index species and of some accompanying species of stratigraphical value is given. An account of their spatial distribution with regard to the Devonian palaeogeography is also provided. The age assignment of these chitinozoan biozones is, as far as possible, based on direct reference to sections containing Devonian GSSP. In other cases, the dating is based on direct correlation with good biostratigraphic markers (e.g. graptolites, conodonts, dacryoconarids). The chitinozoan index species and some important accompanying species are illustrated. One new species, Fungochitina ultima, is described.
|Number of pages||17|
|Journal||CFS Courier Forschungsinstitut Senckenberg|
|Publication status||Published - 2000|
- Global biozones