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Fraxinus pliocaenica Knobloch 1998
Images:
By 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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