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  • Shirbuirnia trigonalis (Buckman 1925)


    Images:

    Ludwigia

    Taxonomy

    Ammonite

    Kingdom: Animalia
    Phylum: Mollusca
    Class: Cephalopoda
    Order: Ammonitida
    Family: Sonniniidae
    Genus: Shirbuirnia
    Species: S. trigonalis
    Author Citation Buckman 1925

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Jurassic
    Epoch: Middle
    International Age: Early Bajocian

    Stratigraphy

    Inferior Oolite Group
    Lower Inferior Oolite Formation

    Biostratigraphy

    laeviuscula zone
    trigonalis subzone

    Provenance

    Collector: Robert Chandler
    Date Collected: 02/04/2017
    Acquired by: Purchase/Trade

    Dimensions

    Diameter: 9 "

    Location

    Sherborne
    Dorset
    England

    Comments

    The colors come from the iron in the neighborhood. One can distinctly see the transition from phragmocone to body chamber. This is the index fossil for the subzone.



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