Edited by oilshale
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Scale Tree
Images: 
By I_gotta_rock (edited)
Taxonomy
Scale Tree
Kingdom: Plantae
Phylum: Lycopodiophyta
Class: Isoetopsida.
Order: Lepidodendrales
Family: Sigillariaceae
Genus: Syringodendron
Species: Syringodendron sp.
Geological Time Scale
Eon: Phanerozoic
Era: Paleozoic
Period: Carboniferous
Sub Period: None
Epoch: Late
International Age: Pennsylvanian
Stratigraphy
Lewellyn Formation
Provenance
Collector: Heather Siple
Date Collected: 04/21/2017
Acquired by: Field Collection
Dimensions
Length: 12.8 cm
Width: 13.4 cm
Thickness: 2.2 cm
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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