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Andrew Alden

It's Collect Rocks Day

By September 16, 2010

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collect rocksNaturally, I always forget that September 16 is Collect Rocks Day. Because EVERY day is Collect Rocks Day for me. (Garry Hayes, of the Geotripper blog, also almost missed it.)

The latest rock I collected is this piece of Bishop Tuff, which I collected from near the mouth of the Owens River Gorge in the volcanic tablelands north of Bishop, California. The Bishop Tuff is the hardened ashfall of a stupendous volcanic eruption that took place about 600,000 years ago where the Long Valley Caldera sits today. The tuff is found all over the west as a marker bed, but it's hundreds of meters thick here. Every geologist should have a piece of it.
Bishop tuff — Geology Guide photo


September 17, 2010 at 1:50 pm
(1) Lena Daugherty says:

I found a small rock that came from a quarry that is a shape of a face. It looks like a small gnome. It has ears, eyes, nose, mouth………everything. People are amazed when they see it. It’s funny that out of thousands of small rocks, this one popped out at me. I would love to send you a photo of it. Yes, even in a photo it’s unbelieveable. Let me know if you are interested in looking at it. I haven’t done anything to it, not even clean the dirt off.


September 17, 2010 at 3:54 pm
(2) Geology Guide says:

Sure, Lena, send it to me and I’ll add it to the Pet Rocks Gallery.

Luke, I recommend that you put a good picture of your rock up on the Forum.

September 17, 2010 at 3:53 pm
(3) Luke says:

I found a completely black rock by the beach, it’s really light and is shiny but also dull, it doesn’t crumble and releases no powder (like coal). Can you identify it please, no one I ask knows what it is.

September 18, 2010 at 9:34 am
(4) vikash mishra says:

really wonderful, I always try to look into such rocks because these actually tells about ancient time, how it was? sir I am very glad to see such rocks and i hope that you will provide us some more valuable knowledge related to geology.
Thank you sir
your’s sincerely
Vikash Mishra

September 16, 2011 at 3:14 am
(5) Rocco von Baron says:

Luke, it may be obsidian. Is it shiny?

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