Since William Smith published his famous 1815 geologic map of Great Britain, geologic maps have become an indispensable and versatile tool to understand the Earth. From these “primary” data maps, users are able to generate “derivative” maps (Dramis et al., 2011) to understand mineral and petroleum deposits, to predict rock units and conditions in the subsurface, and to estimate engineering geologic properties in areas where surficial materials dominate, among other things. A recent article even goes so far as to suggest the value in a “properties first” mapping style instead of a “classification first” style (Kirkwood, 2022...

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