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May 6, 2017 at 23:27 comment added Wayne +1. @DonyorM it seems like your key requirements are that future archaeologists would be able to see that the structure involved generically-modified plants and the odd strengthening of wood? The GM part of this would not be that the wood was stone-strong -- that's due to advanced chemistry -- but that the trees grew into building shapes and in a short-enough period of time to be useful, and so couldn't be natural.
May 5, 2017 at 16:07 comment added Catgut @DonyorM, it is almost entirely inorganic compounds once the petrification process is complete, but it copies the vascular structure of the original plant. It would be very obvious under a microscope that it is essentially a tree made of rock, and therefore neither natural rock nor a natural plant.
May 5, 2017 at 16:02 comment added Mołot Nice. Similar to Polish black oak, but with oak there is little to no decomposition of original wood, just addition of rock. Glad to see you can go even more "rocky" .
May 5, 2017 at 16:01 comment added DonyorM If I chipped off a tiny bit of this petrified wood and brought it to a modern lab, could they -- without context -- tell me if the rock was completely inorganic or from petrified wood?
May 5, 2017 at 15:56 history answered Catgut CC BY-SA 3.0