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  • Fraxinus pliocaenica Knobloch 1998


    Images:

    oilshale

    Taxonomy

    Ash

    Kingdom: Plantae
    Phylum: Spermatophyta
    Class: Magnoliopsida Cronquist et al. 1996
    Order: Scrophulariales
    Family: Oleaceae von Hoffmannsegg and Link 1809
    Genus: Fraxinus
    Species: Fraxinus pliocaenica
    Author Citation Knobloch 1998

    Geological Time Scale

    Eon: Phanerozoic
    Era: Cenozoic
    Period: Neogene
    Sub Period: None
    Epoch: Pliocene
    International Age: Piacenzian

    Stratigraphy

    Willershausen Formation

    Provenance

    Collector: T. Bastelberger
    Date Collected: 06/01/1969
    Acquired by: Field Collection

    Dimensions

    Length: 8 cm

    Location

    Clay pit Willershausen
    Northeim District
    Lower Saxony
    Germany

    Comments

    Taxonomy from Fossilworks.org.

    Diagnosis from Knobloch 1998, p. 81: "Leaves imparipinnate with seven leaflets, the terminal leaflets up to 8.2 x 2.4 cm, the lateral leaflets reach sizes up to 6 x 2.2 or 6.6 x 1.4 cm. The leaflets are narrowly elliptic or oblong-lanceolate, adnate to the rachis without petioles, gradually tapering to a rather long point, their base is wedge-shaped or rounded-wedge-shaped, the margin is distantly serrate, the teeth are abuttingly directed forward, the incisions sharp. The secondary nerve is distinctly weak, not very pronounced and hardly visible. The arcuate secondary nerves bifurcate just before the leaf margin and branch from the straight median nerve at obtuse angles, one secondary nerve can innervate one tooth as well as two teeth, sometimes intermediate nerves occur. The tertiary nerves form a very loose, large-meshed network (no anastomoses between two secondary nerves."

    References:

    Knobloch, Ervin (1998): Der pliozäne Laubwald von Willershausen am Harz (Mitteleuropa). München. Documenta Naturae. 1998. 302 S. : Ill.. 

     




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