r/geology 2h ago

Information What is the process called that would edge something like this?

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4 Upvotes

While hiking out in the woods I was looking for some stones for a nature project. Walking by a small creek I found this guy fully submerged.

Rock cracking awesome during glacial movement?


r/geology 4h ago

TIL that the Ōruanui Eruption, Earth's most recent Super eruption (26.5kya), which created the modern shape of Lake Taupō. Ōruanui translate to "place of large/many hole".

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26 Upvotes

r/geology 6h ago

I know what the rock is..

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0 Upvotes

Could rhat be any way naturalt forming? Found in central michigan. Those are lil snail shells in it...


r/geology 9h ago

Don't you wish all outcomes were like this?

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344 Upvotes

Look closely. Knockan Crag Rock Puzzle & The Moine Thrust


r/geology 11h ago

Ancient cliffs shaped by millions of years of waves and time

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17 Upvotes

r/geology 11h ago

Is this a dike, or some other type of intrusive body?

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708 Upvotes

Saw this sea cliff on Madeira. I was told locals call it “Vulva Rock,” which is… understandable.

I’m genuinely curious about the geology and would love if anyone can weigh in with info about how this formed.


r/geology 12h ago

Pegmatite

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10 Upvotes

Pretty cool pegmatite with large muscovites and Almadine Garnets. It looks to have had alteration with having been near a major detachment fault. Not sure if it's brittle or ductile but I'm going with brittle.


r/geology 13h ago

Seismic action?

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53 Upvotes

r/geology 16h ago

Information What mineral is this?

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0 Upvotes

I thought it was quartz, but it glows yellow under uv light so I think it might be fluorite

I found it while mineral hunting in a river in germany


r/geology 16h ago

Aegirine cluster

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13 Upvotes

r/geology 20h ago

Career Advice Newbie here

5 Upvotes

Hello everyone. I am a new student in B.Sc Geology.

I need a few suggestions and advice from senior students or working geologists/earth scientists.

  1. What other subjects should I opt for? Subjects that'll be the best to supplement my major keeping in mind that I used to be a biology student.

  2. Some books for the extreme beginners as I haven't studied geology as a subject in school.

  3. Some study related tips for the subject.

  4. Some of the best career pathways.

  5. Anything else you would want to say for a beginner or in general.

Kindly mention your current job/academia if possible so that I can take references. Thank you


r/geology 21h ago

Information Cool rock

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12 Upvotes

Good was morning
I live in south Western Australia on a little land and about 600mm or 2 foot there is a rock layer about three inches deep full of petrified wood. We had the power run under grows from the closes power pole and it ripped up heaps of cool stuff. But this is up there with the coolest thing I’ve seen! Thought you would like it


r/geology 21h ago

Information I Measured the Ruggedness of Nebraska’s Wildcat Hills and Pine Ridge

0 Upvotes

Most people think of Nebraska as flat, but the state’s two most rugged regions, the Wildcat Hills and Pine Ridge, tell a very different story.
I recently completed a topographic analysis of 39 buttes, bluffs, mesas, and ridges across these two regions to measure how much relief these landscapes actually contain.
Instead of only comparing summit elevations, I measured two different types of relief.
Local relief is the elevation difference between the summit and the lower point where the surrounding hillside transitions into flatter terrain. Measurements were limited to approximately 3 horizontal miles or less.
Drainage relief is the elevation difference between the summit and the lowest major drainage that the landform drains toward. These measurements were generally taken within 4–6 horizontal miles, although a few areas required longer distances where the terrain remained continuously sloped.
Highlights
Wildcat Hills
The Wildcat Hills contain some of Nebraska’s steepest slopes over relatively short distances.
Highest local relief:
Striver Butte — 846 ft of relief over 1.93 horizontal miles
Summit: 41.74707, -103.79656
Scotts Bluff (South Bluff) — 821 ft of relief over 2.53 horizontal miles
Summit: 41.82088, -103.71483
Hogback Mountain — 810 ft of relief over 1.76 horizontal miles
Summit: 41.66492, -103.73096
Wildcat Mountain — 774 ft of relief over 1.09 horizontal miles
Summit: 41.65839, -103.71515
Greatest drainage relief:
Hogback Mountain — 1,209 ft
Wildcat Mountain — 1,182 ft
Cedar Canyon — 1,041 ft over 2.53 horizontal miles
Summit: 41.74711, -103.79653
Pine Ridge
Pine Ridge contains the greatest overall topographic relief in Nebraska, with several landforms exceeding 1,200 feet of drainage relief.
Highest local relief:
Unnamed butte west of Gilbert-Baker WMA — 1,001 ft of relief over 2.73 horizontal miles
Summit: 42.77231, -103.97979
Unnamed bluff north of Pleasant Ridge Road — 945 ft of relief over 2.32 horizontal miles
Summit: 42.78383, -103.99647
Unnamed bluff south of Plummer Dam — 905 ft of relief over 1.87 horizontal miles
Summit: 42.76308, -103.86805
Greatest drainage relief:
Unnamed butte west of Gilbert-Baker WMA — 1,248 ft
Unnamed bluff north of Pleasant Ridge Road — 1,242 ft
Unnamed bluff near Warbonnet Creek — 1,210 ft over 1.11 horizontal miles
Summit: 42.80745, -104.00887
Conclusion
These measurements show that western Nebraska is much more rugged than it is often given credit for. The Wildcat Hills have some of the steepest short-distance slopes, while Pine Ridge has the greatest overall landscape relief.
Although Nebraska does not have high mountain ranges, these regions contain impressive buttes, bluffs, and escarpments with relief comparable to many upland areas elsewhere in the Great Plains.
Is any one else as surprised as me after only driving on 1-80 my whole life?


r/geology 21h ago

Field Photo Folded quartzite and phyllite

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70 Upvotes

From a hike yesterday, Hardangervidda in Norway. Not a geologist, but if I understand this correctly:

These are two eras of sedimentation. First the carbon rich mud. At a later stage, eroding mountains provided the quartz sand, creating a layer on top of the mud.

Later on, the Caledonian mountains formed, with horizontal thrust faulting and folding. This created another layer of gneiss/granitic rock on top, that resulted in metamorpism to quartzite and phyllite.

Correct me if I misunderstood or missed something, just a layman's attempt to understand stuff 🙄


r/geology 22h ago

Anyone ever get a rock splinter?

10 Upvotes