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billpincus.bsky.social
@billpincus.bsky.social
I am a professional geologist who has specialized in economic geology with an empahsis on the epithermal - porphyry environment. Looking to exchange ideas, photos, knowledge.

I live in Colorado and am re-teaching myself the local geology.
This is great but check out ROCKD. It’s a free app from University of Wisconsin geology department (although you can make a donation). It’s awesome.
September 8, 2025 at 11:54 PM
Put a drop of hydrochloric acid on it. If it fizzes it’s calcite.
August 27, 2025 at 2:35 PM
Concerned about what?
July 14, 2025 at 3:15 AM
What help is geology? Since graduating w a degree in geology 45 years ago I have been involved in the discovery of 8 ore deposits. Do you use a cell phone, drive a car or have you been treated for burns with silver impregnated bandages? Then you used the metals I helped find. You’re welcome.
June 2, 2025 at 11:27 PM
This is the Jurassic Navajo Sandstone that covers much of the southwest US. It is a wind-blown sand. What you are looking at is cross-bedding. In this case they are essentially fossilized sand dunes.
April 23, 2025 at 3:29 AM
When Laurasia and Gondwana came together it was called Pangea. So I guess the answer is yes two continents colliding become one new continent. But, of course they can break apart too. It’s an endless cycle.
March 24, 2025 at 2:13 PM
An 1815 version hangs in the lobby of the Geological Society of London. You should visit it. They were very nice to this visiting geologist.
March 24, 2025 at 2:02 PM
The Richter scale has not been used for a very long time. The current standard and most commonly used is the moment magnitude scale.

Here’s a description: www.usgs.gov/faqs/moment-...
Moment magnitude, Richter scale - what are the different magnitude scales, and why are there so many?
Earthquake size, as measured by the Richter Scale is a well known, but not well understood, concept. The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the ...
www.usgs.gov
March 9, 2025 at 9:06 PM
Just to be clear at this point in time Uk has exactly 0 rare earth metal reserves per USGS. Perhaps it does have potential but there is a long way to go to demonstrate that any significant rare earth metal can be produced.
March 2, 2025 at 4:15 AM
Actually I very much doubt it. Hard to tell from photo but this appears to be an igneous rock. My first impression was that this is manganese oxide in a form known as dendritic growth. Much after the initial rock was formed water has moved along crack depositing the MnO2 in this form.
Landing
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February 28, 2025 at 10:45 PM
JFK was a child during the Great Depression. You mean FDR. This was when radio was still a new medium.
February 27, 2025 at 3:58 PM
These are most likely preCambrian metamorphosed sedimentary rocks. They are 2.6 billion years old and are some of the oldest rock in the USA.
February 7, 2025 at 8:30 PM
As an economic geologist (fancy name for a prospector) I’d like to say that first, Canada has some of the best and most experienced geologist in the world. Second, finding a deposit and the building a mine is a very expensive and time-consuming process. “Just opening a mine” is not so simple.
February 7, 2025 at 7:16 PM
Actually, isn’t that geography not geology?
January 16, 2025 at 6:19 AM
Where on the Oregon coast?
January 16, 2025 at 6:16 AM
A good book on both subjects is “Timefulness” by Marcia Bjornerud. The book examines climate
change through geologic history. It’s written for the layman but has a fair amount of technical reasoning. Besides being a geology prof she is an elegant writer.
November 29, 2024 at 8:15 PM
BTW. The short answer is lots of volcanoes.
November 29, 2024 at 6:16 PM
I don’t know your level of geologic training but for a good intro to Nevada try “Roadside Geology of Nevada.” Also try the Nevada Bureau of Mines and Geology website.
November 29, 2024 at 6:15 PM
Hard to tell, on closer inspection it looks like a finer-grained equivalent of the host rock but I would need to scratch, sniff and otherwise examine.
November 27, 2024 at 6:39 PM
Looks about right.
November 27, 2024 at 5:35 PM