Identifying the Wood Pavers

What happens here

Upon closer inspection of the exposed material, the person realizes that the 'pavers' are not stone but wood. They pick up one of the rectangular blocks from the road, confirming its wooden composition, complete with visible wood grain and texture, and what appears to be wood dust beneath. The blocks are dark and appear treated, consistent with old road construction materials.

Goal: Confirm that the underlying road material is wood, not stone.