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  • Images:

    I_gotta_rock
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      Kathleen B. Pigg of the University of Arizona notes that this "stem subsurface pattern that is sometimes called 'rabbit tracks'. The double track you see is probably a result of a pair of air channels that accompany the leaf trace through the cortex. The vertical ribs are produced by an increase of bark through secondary tissue production."
      The pair of sepicemns in the first image are the positive and negative impressions of the same piece. The second image is a detail from the same specimen.

    Taxonomy

    Scale Tree

    Kingdom: Plantae
    Phylum: Lycopodiophyta
    Class: Isoetopsida.
    Order: Lepidodendrales
    Family: Sigillariaceae
    Genus: Syringodendron
    Species: S. sp.

    Geological Time Scale

    Era: Paleozoic
    Period: Carboniferous
    Epoch: Late
    International Age: Pennsylvanian

    Stratigraphy

    Lewellyn Formation

    Provenance

    Collector: Heather Siple
    Date Collected: 04/21/2017
    Acquired by: Field Collection

    Dimensions

    Blank: 12.8cm
    Width: 13.4cm
    Thickness: 2.2cm

    Location

    Carbondale tailings pile behind Summit Gardens Apartments off Westgate Rd.
    Lackawanna County
    Pennsylvania
    United States

    Comments

     
    Kathleen B. Pigg of the University of Arizona notes that this "stem subsurface pattern that is sometimes called 'rabbit tracks'. The double track you see is probably a result of a pair of air channels that accompany the leaf trace through the cortex. The vertical ribs are produced by an increase of bark through secondary tissue production."
    The pair of sepicemns in the first image are the positive and negative impressions of the same piece. The second image is a detail from the same specimen.


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