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Found 1 result

  1. Hello Forum, Recently, I acquired the petrified wood specimen (probably maple, Acer sp.) below at a local mineral show. It comes from the Holleywood Ranch in Linn County, Oregon. The broader area, well known for its petrified wood, is often referred to as "Sweet Home", or the Sweet Home Petrified Forest. According to Gregory (1968), the petrified wood is derived from some Miocene age subunit of the Little Butte Volcanic Series (details not entirely clear to me). I really liked the specimen because it shows a structure that I would interpret as the phloem (see this and this website). Though dependent on your definition of the term, this would mean part of the bark is preserved (quite rare, in my experience). Below the photo is an annotated micrograph of the region indicated in the overview. Does my interpretation make sense? Is this really wood (secondary xylem) plus the bark? I would also like to know why the last growth ring(s) of secondary xylem would stick to the bark? I can imagine the latter swelling up and becoming loose as the wood (waterlogged) was underwater for some time, but why not de-bond at the cambium then? Thanks for your feedback! Tim (micrograph made as follows)
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