Unexpected Geode Find!

Returned to my collecting area with a rock that showed interesting character but little lime/green under SW UV. Best to break it open to see if any more UV would be revealed. While I hoped for decent response, I was not expecting this rhyolite to be a geode.

Last year I collected a similar looking rock from the Armagosa Valley in Nye County, Nevada. Bryan Smalley cut it open and it was just a sad looking mix of brown rhyolite and quartz. This is now my first self-collected geode. I normally would not hunt them since I have no idea where they might be.

I am still looking for uranium occurrences and have had yet to find any. I may, though, have identified sanidine crystals in tuff so that is a good thing. I’ll be back.

Breaking it Open In The Field

Unexpected Geode Find! from Thomas Farley on Vimeo.

 

Under SW UV, Along With My First Brachiopod (Shell)

Unexpected Geode Find Under Shortwave UV from Thomas Farley on Vimeo.

Other

I also found my first brachiopod! Photo below:


Concrection?

I may have also discovered a concretion naturally split apart. See below.

Concretions are typically sandstone based. Those might form around a piece of a shell (limestone in nature) or a bit of calcite. My rock fizzes hardly at all, which makes me think it is not sedimentary. Bates and Jackson say concretions can also form around a leaf, bone or fossil and that concretions can derive from “fragmental volcanic rocks.” I’m still reading up on this.

Picture below is my rock and a reference sample I have from Geological Specimen Supply. That rock comes from the Tule Wash in Imperial, County, California.

Location

35.830022, -115.285060

Jean Quad

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