7 Dec 2018, 02:13 by joseph.eisenb...@gmail.com: > natural=rock and rock=petrified_wood could also work well. I wonder if > there is already a way to classify types of rock formations, eg > limestone, granite, basalt? > material tag?
https://taginfo.openstreetmap.org/keys/?key=material <https://taginfo.openstreetmap.org/keys/?key=material>
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