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Rock I found... what are these little holes?
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You are currently reading a thread in /sci/ - Science & Math

Thread replies: 46
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So I went hiking at Blanco County, Texas, and found this rock nearby a stream.

What kind of rock is it? And what are those little holes??

I tried the web and nothing! So maybe someone here is into Geology.

I'll post other angles.
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Its just water erosion. Seen it plenty on the appalachian trail. It may also be from glaciers, but since its in Texas, its probably from a delta from the past.
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This is the back...
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>>7769229
So a delta can make same formations as a glaciar/glaciar retreat?
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>>7769234
In some cases yes. If the glacier is at its end and melting, it can form waterfalls.
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>>7769240
And the water would have made those tiny holes... why the same size, is that normal?
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>>7769255
Its erosion. Doesn't even seem like something from texas
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>>7769229
>>7769240
>>7769266

You're a complete fucking idiot please stop posting

Leave the sciences forever

Stupid fuck
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>>7769227
My first guess is that they're small "potholes" formed by the erosive action of sediment-bearing water.

It could also be erosion caused by some sort of biological agent, like a boring organism such as a sponge. Potholes would still be my first guess though.
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>>7769268
Then what is the cause, oh white knight?
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>>7769276
To elaborate on this, its possible that the rock contained readily dissolved minerals or coal fragments that were removed from the rock subsequent to its exhumation, creating small holes. The erosive action of the sediment-bearing water would have enlarged these holes as well as rounded them out. This would explain the morphology of the holes as well as their odd placement.
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>>7769283
OP here... this is an interesting theory as well. And would explain the small fractures surrounding it, right?
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>>7769283
The holes seem to be clustered along some fissures in the rock, making me lean towards there being a significant chemical component to the weathering.

OP, wanna do an experiment? Pour a little vinegar on the rock. If it starts bubbling and fizzing, then it's a carbonite rock like limestone or dolomite that's highly subject to chemical weathering.
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>>7769294
Ok, let me try. Will do it.
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>>7769293
The rock appears to have been fractured prior to its exhumation. The erosive action of water probably acted to enlarge the more prominent fractures.
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>>7769294
>>7769229
>>7769240
>>7769266

Drop out and get into a trade while you still can.
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>>7769294
OP here...

The experiment was as you predicted! The rock produced bubbles (mainly from those little holes) but most of all it fizzed.

I shot video, but the fizzing sound is not audible. Here's a screenshot of the video.
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>>7769294
And here's a gif of one of the bubbles.
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>>7769227
Hey OP.

That looks a lot to me like a piece of fossilized seafloor, and what you have there are ancient worm burrows.

It could also, maybe, be depressions left from roots, but generally tree roots will also fossilize/petrify, and the rock itself really looks like it was once a soft mud. Still, this could have happened if the plant rotted out, pretty rare tho.

It's not gas bubbles, there is too much order. It's most absolutely not water erosion, >>7769229
is a complete idiot.

I would recommend walking around the area some more and looking for similar stones, you might get lucky and find something even more interesting.
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>>7769294
Vinegar will fizz on just about any stone surface because of trace chemicals from the environment. Also if you want to get limestone to actually fizz, you need to use a stronger acid like HCl.
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>>7769331
Hey... OP here

I'm no longer there at Texas hill country. I was visiting family and friends. But... I brought myself another rock. Here's the pic.
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>>7769304
Drop on your knees and go suck a dick
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>>7769331
Another angle of 2nd rock.

Found both at the same area but not together.

Also both have strong odor of wet soil. Just something that caught my attention, as I've never found rocks or archeological debris abroad that smell. (My actual expertise is finding ancient ceramics and obsidian debris, but have only really basic knowledge of geology).
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>>7769227
If I had to guess from these pictures, I'd say it's dolomitized limestone (>>7769294 & >>7769331 mentioned this already). Based on that, I'd say the holes are some sort of trace fossil.
It's hard to tell because of how weathered the rock is but those look like they could be diplocraterion, a trace left by a worm creature that lived in U shaped burrows.

>>7769340
>>7769347
Bit hard to tell, but I'd say that this is more of the same. The wet soil odor is probably because you got them from wet soil.
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>>7769365
OP here... yes it looks like such organisms. Though no other traces, just little holes.
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>>7769227
sup spic-kun
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the bite marks of a rock golem
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>>7770349
I know, right? I thought the same, because it fits like an actual bite.
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>>7769347
Geologist here.

The right hand side of your sample looks "fresh", i.e. un-weathered. Image of that side please to help better identify it.

The anon/s suggesting limestone (sea-bed) are likely correct. Limestones are comprised of essentially 100% marine fossils. Mostly calcareous creatures like early corals and bivalves etc. In some cases beds and beds of organisms can be seen including 'soft' creatures like Crinoids but many get baked and are metamorphosed or get churned up by tectonic processes resulting in a soup of mashed up shell and coral so one can't always see any actual organisms like a rugose coral or whatever. Regardless, their composition is of mostly Ca type minerals all of which are easily consumed by acids and many predatory creatures (past and present) evolved ways to bore perfectly circular holes through protective shells to get to their prey hiding inside.
>>7769276 This anon's second conjecture is spot on, the first one however is not. The spherical erosion action creates what are called ooids. Ooids do not create the "potholes" and ooids usually only occur in lagoons with low temp variance. Also, if it were the result of sediment\bearing water erosion. you would have a Conglomerate with varied breccia sizes
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>>7772294
Jesus christ everything in this post is incorrect.

I sincerely hope that you're just a precocious freshman and not actually doing geological work. If you are practicing geoscience then you're astonishingly incompetent and need to completely overhaul your understanding of sedimentology.

I'd expect a more factual analysis from a 1st year student. I'm 100% serious. You are a danger to the public if you are practicing geoscience.
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>>7772294
OP here...

You mean the right side of the first actual rock, or the second one I posted?

So, holes may have been created recently?
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>>7772621
OP here... what's your take in this?
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>>7769227
Its pumice, volcanic. Dont listen to these other retards

No idea why it would be in Texas though
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not op but when we have strange stones
can any one give me informations about this stone
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>>7773953
pic 2
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>>7772294
>geologist here
confirmed highschooler
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>>7773174
>its pumice
it's obviously limestone you twit
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>>7773982
Dolostone 2bh senpai
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OP here...

Seems this rock has created quite a buzz but not that much of a consensus.

I'm no geologist, but is it that difficult to pinpoint a rock with just a picture? Let alone the little holes. There were interesting theories though, and outside 4chan I was told it may be a sponge fossil.

Still... the debate may continue.
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>>7773953
>>7773960
What did you take these photos with? A fucking Nokia flip?

>>7774840
It's difficult to infer much from the resolution of the photos that you've provided. It would be much easier to identify in-person.
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>>7769227
/x/phile here
it's a seeing stone
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>>7774845
OP here... those last two pictures are not mine. Mine are at the beginning of the thread. I'll try and shot my stone with an actual camera though.
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>>7774847
OP here...

Please ellaborate. Seeing stones as those from Tolkien's books? Or what kind?
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>>7774845
no a samsung galaxy A3
sometimes the autofocus work
sometimes not
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>>7769268
This is why I hate [spoiler]and love[/spoiler] /sci/
Thread replies: 46
Thread images: 10
Thread DB ID: 417394



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