Me mate thinks they might be eucalyptus - I dunno about that as I thought that those gum-type trees were rot-prone. This stuff definately is not haha. It's not ironbark either, I had the fun job of drilling and popping some ironbark piles off underwater to get the sticky-upy bits out of the way for a new single-span bridge. The popping bit was easy, the drilling to set the charges not so much. Using a sharp self-pulling screw auger made your eyeballs vibrate, not a pleasant exercise under water...
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