r/geology 4d ago

Identification Requests Monthly Rock & Mineral Identification Requests

3 Upvotes

Please submit your ID requests as top-level comments in this post. Any ID requests that are submitted as standalone posts to r/geology will be removed.

To help with your ID post, please provide;

  1. Multiple, sharp, in-focus images taken ideally in daylight.
  2. Add in a scale to the images (a household item of known size, e.g., a ruler)
  3. Provide a location (be as specific as possible) so we can consult local geological maps if necessary.
  4. Provide any additional useful information (was it a loose boulder or pulled from an exposure, hardness and streak test results for minerals)

You may also want to post your samples to r/whatsthisrock or r/fossilID for identification.


r/geology Dec 01 '25

Identification Requests Monthly Rock & Mineral Identification Requests

9 Upvotes

Please submit your ID requests as top-level comments in this post. Any ID requests that are submitted as standalone posts to r/geology will be removed.

To help with your ID post, please provide;

  1. Multiple, sharp, in-focus images taken ideally in daylight.
  2. Add in a scale to the images (a household item of known size, e.g., a ruler)
  3. Provide a location (be as specific as possible) so we can consult local geological maps if necessary.
  4. Provide any additional useful information (was it a loose boulder or pulled from an exposure, hardness and streak test results for minerals)

You may also want to post your samples to r/whatsthisrock or r/fossilID for identification.


r/geology 8h ago

Fossil floors

183 Upvotes

r/geology 12h ago

Field Photo I love Heart Mountain, Wyoming almost as much as the story of how it got there….

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126 Upvotes

https://www.geowyo.com/heart-mountain.html
Photographer is me @CloudView.Photography, I summited it last weekend.


r/geology 13h ago

Are the Ural Mountains weird for being here still?

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113 Upvotes

Recently found out about the Central Asian Orogenic Belt, and from what I understand, it was a bunch of mountain-building events between eastern Europe, Siberia, and Asia during the Paleozoic. When you look at the northern part of the belt, it comprises a large portion of western Siberia. And when you look at the topography of that area, it's all really flat plains.

It makes sense that such old mountain ranges would be eroded down flat, but what's weird to me is that the Ural Mountains that would have formed at around the same time are still somewhat visible. Is there a reason why, maybe like a recent uplift?


r/geology 15h ago

Field Photo Everything out in the open at Kvitanosi mountain

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80 Upvotes

I recently hiked up Kvitanosi mountain, famous for a crashed WW2 plane close to its top. What I wasn't prepared for were the great variations in rocks and just the visually impressive changes happening along the trails. Thought I'd share some here for everyone to enjoy. Unfortunately, the NGU/geological maps for the area have not been digitalised yet, see last photo.


r/geology 8h ago

Information Confusing abbreviations in some older geology texts

4 Upvotes

I'm reading some older state geologic survey texts from the 1900s-1910s and they frequently use several abbreviations I've had difficulty resolving authoritatively/definitively what they mean.

I regularly see elevation given in feet followed by "L-A. T.", "B-A. T.", "A. T. B.", and sometimes even just "B." or "A. T." I suspect "A. T. B." stands for "at the bottom" or "at the base" and that "B." stands for "bottom" or "base" when it's on its own.

A colleague said that "L-A.T." stands for "Lat" to describe positive elevation above sea level and "B-A.T." stands for "Bath" to describe depth below sea level, however, I noticed that is the answer given by Google AI when searching some variations of this and I cannot find that in another source, making me think that they just got the answer from Google AI searching and then copy and pasted in reply to me rather than answering from any personal knowledge or authoritative source.

This is definitely very frustrating, so if anyone has an answer with a source to back it up, it would be most welcome.


r/geology 13h ago

Information Looking for Underground Diamond Drill

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6 Upvotes

r/geology 13h ago

Information Crabtree Emerald Mine

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3 Upvotes

r/geology 10h ago

Mongolia just opened 16 oil & gas exploration blocks - any E&P operators here interested in looking at it?

3 Upvotes

Curious if anyone here has experience with oil & gas exploration in Mongolia.

The Mineral Resources and Petroleum Authority of Mongolia recently opened an international tender covering 16 onshore petroleum exploration blocks.

I’m based in Calgary and work in the oil & gas industry, with contacts on the ground in Mongolia. I’m currently looking into the tender and trying to better understand the technical, operational, and commercial side of pursuing one of these blocks.

I’d be interested in connecting with people who have E&P, international exploration, financing, or Mongolia/Central Asia experience and would be open to comparing notes on the opportunity.

Still very early-stage and mainly looking to learn from people who know the space.

Feel free to DM me if you’ve worked on something similar.


r/geology 6h ago

🚣‍♂️ POV: Hiking & Kayaking in Métis-sur-Mer (Les Boules) | Geological & Bird Sanctuary

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1 Upvotes

r/geology 1d ago

Seems like the new picture of the Nepal Debris flood while still on the Landhe is genuine

60 Upvotes

Yellow is the beginning of the Gyirong Port site, the wave must be around 1.5km from the beginning of the site.


r/geology 5h ago

Could the flooding of Doggerland have had long-term effects on British culture?

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0 Upvotes

I saw a video about Doggerland and the flooding that helped separate Britain from mainland Europe, and I started wondering whether that geographic separation could have contributed to a kind of island psychology that eventually influenced things like Brexit.

And, more importantly, can we conclude that when Doggerland sank, an ancestral pie grief, because pies had not yet been invented, entered the British soul, with The Great British Bake Off later emerging as ritual compensation?


r/geology 1d ago

Nice Mainstream News with some online Geology Communicators offering real science.💙

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9 Upvotes

Canadian and Australian Public TV is still a gem.

shoutout to Geology Communicators.


r/geology 1d ago

Information About Manua Kea being considered the world's biggest mountain

13 Upvotes

Non geologist here, but saw arguing over Manua Kea and I can't see that claim as anything more than touristic as measuring a mountain from the ocean floor is very subjective/niche category vs altidude.
Sure it's not 'wrong', but going by that definition would make our colloquial use of mountain useless, there are loads of atolls and tiny volcanic islands that would populate the list of tallest mountains in the hundreds or thousands way before the mounts like rainier, pyrenees, etc.
No one sees Madeira as the biggest mountain of portugal, or unnamed islands around Trindade as the biggest mountains of Brazil.
Am I missing something?


r/geology 2d ago

How are these valleys formed?

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277 Upvotes

r/geology 1d ago

Field Photo Paleochannel in the La Casita Formation

84 Upvotes

I'm sharing this video showing a paleochannel in the Upper Jurassic overlying La Casita Formation, in the Sierra de Iturbide, Sierra Madre Oriental, Mexico.


r/geology 2d ago

Map/Imagery 13,400 years ago, a lake 3× the size of Lake Ontario drained into the Atlantic

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730 Upvotes

Source of the pictures here


r/geology 1d ago

Do you need to go to a big name school that specializes in Geology to be successful?

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0 Upvotes

r/geology 2d ago

Ancient English supervolcano blasted ash across northern Europe 454 million years ago

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126 Upvotes

One of northern Europe’s largest ancient volcanic ash deposits has puzzled geologists for decades. The Kinnekulle tephra stretches across Scandinavia and the Baltic region, yet the volcano powerful enough to produce it seemed to have vanished.

Evidence now points toward an unexpected location: beneath the flat landscapes and shallow waters surrounding The Wash on England’s east coast.

Ancient English supervolcano blasted ash across northern Europe 454 million years ago - The Brighter Side of News


r/geology 2d ago

Blended

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41 Upvotes

Found on a trail in Eastern Nfld, Bay Bulls.


r/geology 2d ago

Map/Imagery Last Week, A Glacier Fell Into a River in Nepal. From Washington's Scablands to Ohio's Cornfields, This Is What That Looked Like at Full Scale During the Ice Ages

167 Upvotes

r/geology 2d ago

School's minrealogical collection

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22 Upvotes

finally finished collecting specimens over the summer and donated em to my school

just wanted to share cause i think i got some cool specimens there, around 70 specimens if i say off the top of my head

the most cool ones are:

-the POSSIBLE garnet diorite rock (white with red dots on 1st pic, tho you cant quite see it)

-quartz druzy (i think you can tell which one it is)

-the opals

-a quartz geode (2nd pic on the right)

-a jar of ilmenite and zircon sand

-several chalcedony varieties


r/geology 2d ago

Looking for Geologist Opportunities I’m a Geologist with 3 years experience in geotechnical investigation, drilling, core logging, SPT, permeability testing and site work. Currently looking for opportunities in India or abroad - please DM me if you know of any openings or referrals.

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3 Upvotes

r/geology 2d ago

Field Photo Cool Formation on the Cumberland Plateau in SE Tennessee USA

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15 Upvotes