Topic on User talk:Jsamwrites

I would suggest that this is not the main subject of the articles with the phrase “geologic map” in the title. Rather, I would suggest that those articles are more like instances of “geologic map.”

"geologic map" as a value of 'instance of (P31)' could be another interesting possibility. Following are the reasons behind the use of "P921 (subject)":

1. I considered "geologic map" as a visualization tool.
2. Keeping aside certain items, a vast majority of "scholarly article" items are single-valued for P31.

I understand your logic; it makes good sense to me. For what it’s with, I long ago added geologic map as P31, so we’re covered. I thought it might be redundant, but that’s probably not a significant issue. Take care.