No, not very often ... the roof structures on the sod dwellings out here usually rested directly atop the sod walls, so there were no vertical wood posts at all. (So when those buildings go, their disappearance is pretty complete.) Rarely, I've seen stone footings for vertical log framing in locations where the construction techniques were influenced by a particular ethnic heritage ... like an enclave of Swedish-influenced construction I examined once in North Dakota.
With vernacular log construction in the American west, the sill log of a building often rested on an evenly-spaced series of dry-laid stone footings, and you spot those once in a while.
From an archaeologist's perspective, the thing with building ruins here is that the climate is usually far less humid than what you're used to. That, combined with the fact that my area has only been occupied by Euro-Americans for 150 years or so, means that the ruins of a wooden building are still usually wood! :)
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With vernacular log construction in the American west, the sill log of a building often rested on an evenly-spaced series of dry-laid stone footings, and you spot those once in a while.
From an archaeologist's perspective, the thing with building ruins here is that the climate is usually far less humid than what you're used to. That, combined with the fact that my area has only been occupied by Euro-Americans for 150 years or so, means that the ruins of a wooden building are still usually wood! :)