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The Geologic Column

Richard I Gibson

Geology newsletter by Richard I. Gibson. Anything about geology, with a focus on minerals and tectonics.

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Substack
PricingOnly free issuesPublishesDaily
Issues148SubscribersRead richardigibson.substack.com

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Latest Issues

Recent posts by this newsletter. Browse the email archive.

Camp Davis Formation

The Camp Davis Formation is a pretty local deposit, scattered around a few areas in the southern part of Jackson Hole, Wyoming USA, and the area east of Hoback Junction south of Jackson. Camp Davis, the University of Michigan’s Geologic Fie...

18 days ago
6
0

Spotted Rocks

I think geologists are attracted to the unusual (I am, anyway), and spotted rocks are at least relatively unusual.

21 days ago
10
15

Aurichalcite vs. rosasite

One of the discussion groups at MinDat, the online mineral database, recently addressed the question of distinguishing between these two copper-zinc carbonates. Aurichalcite is (Zn,Cu)5(CO3)2(OH)6 while rosasite is (Cu,Zn)2(CO3)(OH)2. They ...

23 days ago
9
3

Mapping: changes over time

Here are two geologic maps of the same area south of White Sulphur Springs, Montana, one from 1899 and the other published in 2005. Both are more or less reconnaissance in nature, but we had more time (and better context, thanks to the olde...

25 days ago
9
2

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Authors

The writers behind this newsletter.

  • Richard I Gibson

    I'm a geologist and historian living in Butte, Montana USA. Author of the History of the Earth Perpetual Calendar, What Things Are Made Of, and Butte Rocks.

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