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John F McBride's avatar

Another fascinating essay. Thanks. I shared it to a niece who lives in Osburn, Idaho, and works in environmental protection, with a focus on mines and contamination. She has a list of geologic sites to visit, in Idaho and Montana, and will add this.

Richard I Gibson's avatar

There's a new book, "Montana Rocks" by my friend Rob Thomas, focusing on 60 accessible geologic sites in the state. Published by the Geological Soc. of America.

John F McBride's avatar

Thanks. She may know of it but I’ll tell her anyway.