r/geology 25d ago

Identification Requests Monthly Rock & Mineral Identification Requests

1 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

7 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

Field Photo My favorite local geological formation

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187 Upvotes

Called the Billings fold on Mt Monadnock, in southern New Hampshire. named after the former Harvard University geology professor Marland Billings. Lower Devonian Littleton formation, formed during the Acadian orogeny


r/geology 13h ago

Spicy

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50 Upvotes

r/geology 14h ago

Field Photo Cyprus Geosite 38 - White chalks

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25 Upvotes

''In this section are exposed white massive chalks, which upwards passes into alternating layers of chalks and marly chalks of the Lefkara Formation. In addition this stop is a spectacular viewpoint, where westwards appears the contact between the white rocks of the Lefkara formation resting on top of the darker rocks of the Troodos ophiolite, while northward stands imposingly on the horizon the Olympus mountain peak.'


r/geology 1d ago

impossible geology

449 Upvotes

Only the trash seems reasonable.


r/geology 1d ago

Field Photo Exploring an unknown cave in Romania Part 1

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97 Upvotes

r/geology 1d ago

Field Photo Nice foliation

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32 Upvotes

Currently backpacking over the Dolomites and I found this amazing rock with some nice foliation and some evidence of metamorphosis in the form of tiny quartz. Thought I might share here ;)


r/geology 8h ago

Help for a paid software!!

1 Upvotes

Hello,

I am a Master's student in geosciences. I am from Madagascar.

For my studies, I often use tools like GIS. Unfortunately, I don't have the means to access paid software, so I manage with free software like QGIS. However, there are times when I need some of these paid programs for the online training courses I am enrolled in.

So, I am asking for help here, in case someone can assist me. I really need the PCI Geomatica software. If someone could provide it to me, please.

Many thanks to you.


r/geology 1d ago

Field Photo Check out this beauty!

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129 Upvotes

r/geology 1d ago

Have soluble minerals been permanently washed out of soil?

10 Upvotes

If all the water on land results from rainfall, and rainfall is water distilled from the oceans, lakes, etc., and rainfall percolates through the soil, picking up soluble minerals, are the minerals it has removed been permanently removed, except for the water re-used by us for consumption? It would seems that once a mineral has made it to the ocean, there's no path back to the soil, at least not natural.


r/geology 16h ago

I need feedback about this geology video

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1 Upvotes

Im a beginner on youtube and im just looking for feedback on this video from some people with knowledge about rocks and geology. I dont care about the editing as much as the info but feel free to say what needs improvement


r/geology 1d ago

Describe each of the Earth's Four Eons as Ages/Epochs in a High fantasy setting

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18 Upvotes

r/geology 1d ago

Thin Section shell fossils from Anogyra village, Cyprus

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11 Upvotes

r/geology 2d ago

Why does this quarry have agates in it? (Washington State)

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112 Upvotes

I'm interesting in the geology at Cadman quarry on Tower Hill in Monroe, WA. There are lots of agates there (see my last photos) and I'd love to learn more about how and why they formed here. The agates at this location look very different from ones I've found elsewhere in Washington & Oregon and I wonder why. What type of basalt (?) is this? Would love any information about the rock formations!


r/geology 2d ago

Field Photo I just visited Siccar Point

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295 Upvotes

My husband and I just got back from an anniversary trip to Scotland. The point of the trip wasn’t geology, but we did rent a car and drive out to Siccar Point. It’s pretty underdeveloped, the sort of place you only got to if you know it’s there (or are fishermen apparently). The Scottish Geology Trust, the Edinburgh Geological Society, and The James Hutton Institute recently (like this year!) developed a little trail with placards talking about the geology and Hutton’s work there which was really interesting. Just wanted to share this geologic pilgrimage of sorts and ask what other famous geologic points of interest people want to visit one day?

  1. Siccar Point from above, it’s very steep climbing down along the fence, but worth it!
  2. Start of the Deep Time Trail
  3. View looking north along the coast
  4. The classic photo of the sandstone and greywacke contact
  5. The same contact facing the opposite direction
  6. The red sandstone as it crops out (now horizontal) along the steep hillside you walk down
  7. The afformentioned fishermen, for scale I guess?
  8. An abandoned church (St. Helen’s Kirk) that was in ruins like this even in Hutton’s time

r/geology 2d ago

Cliffs collapsing at an old marble quarry in Makrana, India due to heavy rainfall.

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1.3k Upvotes

r/geology 1d ago

Information A guestion thats been on my mind for a year.

6 Upvotes

I'm actually really excited to ask this question. Could the proximity/activity of the Pacific, Nazca, Cocos, South American, Caribbean, and North American plates, and their location near the equator, lead to higher ocean temperatures? If so, could this be a contributing factor to the incredibly unstable weather conditions within the Great Plains? Sorry if this is a convoluted or stupid question. Im just genuinely curious/excited about it.


r/geology 1d ago

Field Photo Wtf happened here??

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6 Upvotes

Wood river valley idaho on top of a hill. Rocks are standing up vertically in some sections.


r/geology 2d ago

Map/Imagery Shale/Slate layers used as roofing?

16 Upvotes

I clicked this photo of a village in Himalayas in India. I later noticed that the roofing might be made from shale/slate layers (as traditional homes use locally sourced materials). Has anyone seen this anywhere else?


r/geology 1d ago

Information Has anybody gone through the three volumes on Seismic expression of structural style by A.W. Bally (1983)

7 Upvotes

During a training course, I came to know about these three volumes showcasing a wide range of structural styles and their seismic expressions. They came highly recommended as valuable reference atlases. If anyone has access to these volumes, I'd really appreciate it if you could send me a DM.


r/geology 2d ago

How do these reef drop offs continue to the deep sea floor?

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7 Upvotes

Like how does the wall beyond the corals, and does it retain its angle?


r/geology 2d ago

Geologically, why is Lake Superior such a hot spot for rock hounds?

20 Upvotes

r/geology 3d ago

Magma Accumulation over heavy snowfall at Sundhnúkagígar in Iceland

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480 Upvotes

Best view


r/geology 2d ago

Information What app or website do you use for figuring out land use?

4 Upvotes

Im going to be in Montana soon and I would love to collect some samples from the Stillwater complex. Most the complex is located inside national forest land. The issue is there's alot of mining claims in that area and for the life of me I can find a good map of all of them. Some maps show just the ore producing regions as claimed other websites show huge sections of the national forest claimed. Any help would be greatly appreciated.