Montana, Chert, and the 1960s.

Two years ago, this rock really caught my eye while I was caving in the Madison Group of Montana.
First of all, there’s a nifty calcite or gypsum encrusted pocket, which looks much like a sparkly pothole…

(My assumption is that this formed as water seeped through the limestone into a small hole, and then crystallized on the hole’s walls.)
Then there’s the missing chunk, which gives a nice look at a crazy banded chert nodule.

If that chert nodule embodies John Lennon’s “Magical Mystery Tour” era, this nearby chert nodule is more Jackie Kennedy:

Way to keep it classy, chert.

Just deserts.

Where I am:

Sault HS Library - it seems like bad form to post an actual picture of our library, given what I'm about to say: it sucks. Hardcore. Too few books, too many people talking, answering cell phones, playing computer games, or eating aromatic soups.
Where I'm supposed to be:

Perhaps it would've been wise to be here earlier, so I could have gone there.