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  • Middle Jurassic to Early Cretaceous radiolarian biochronology of Tethys based on Unitary Association
    Baumgartner, Peter O. ...
    Unitary Associations (U.A.) were calculated with the computer program BIOGRAPH to construct a radiolarian zonation spanning the Middle Jurassic to Early Cretaceous time interval. During test runs, ... over 60 sections including 800 samples were selected to construct the zonation. Since single runs of the entire dataset revealed too many conflicting superpositional relationships between samples, we had to construct composite sections and to use iterative runs of BIOGRAPH. Regional synthese were calculated first. Then, regional syntheses from the Mediterranean were combined to make the core of a "snowball" to which successively more data was added. In this way, all data added later were compared to the initially included sections. A synthesis of the Mediterranean Middle and Late Jurassic is calibrated and discussed as a protoreferential. The final zonation spans the Aalenian to early Aptian time interval. It is based on a synthesis including 127 U.A. that were grouped into 22 Unitary Association Zones (UAZones95: 1-22). Each zone is defined by a number of characteristic taxa or pairs of taxa that co-occur in that zone only. Each zone is calibrated to the standard stages by means of ammonites, nannofossils, calpionellids, dinoflagellates, as well as paleomagnetic and stable isotope stratigraphy. The UAZones are corelated to the earlier zonations of Baumgartner, Gorican, Jud, Murchey, Matsuoka, and Pessagno et al.
    Vir: Middle Jurassic to Lower Cretaceous Radiolaria of Tethys : occurrences, systematics, biochronology (Str. 1013-1048)
    Vrsta gradiva - članek, sestavni del
    Leto - 1995
    Jezik - angleški
    COBISS.SI-ID - 3504173

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