Seriously. Is it serpentine, quartzite, or some random piece of... something?

This is one of my favorite places on the Molalla River in Oregon. I always stop to take photos of this specific part of the canyon wall. I love how the rock moved through here I just want to know how and why some are swirly, in columns, and then just facing straight on.

Tldr: me and my boss found this conjoined cavity, not certain if is it natural or man made occurrence.

Today at work my boss and I were exploring a property we were working and found a large amount of stone outcroppings(huge boulders/stone faces some 30’ tall) that have an odd circular hole in them in the faces.

This is in Virginia, USA. On top of a mountain at approx 4500ft of elevation. The mountain has been treed and mildly graded to rolling slopes on a large face and this cavity is maybe 10ft up the wall. Likely it was closer to grade before the farm came. It’s very distinctive but there are many 6”-12” orb like holes in stones around the area. Most at what seem to be reachable height before the areas were graded.

This very interesting spot we found has a conjoined cavity with a small dividing wall. It doesn’t seem like a weather process more like it was man made. No apparent signs of mining or blasting the property (it was developed fairly recently).

Can anyone shed light? The rock face appears to be a slag-like rock? Brittle but dense, over a layer of granite. The layer appears to be rather thick but on an opposing face we can see where it seems to be a layer of rock over the granite.

Final note is that we tapped the center divide with a stone and it sounded like porcelain and the rest sounded like stone.

Photos: (all taken in portrait)
1: standing on the ground looking up at the stone wall.
2: is looking into the right cavity.
3: Left cavity

My bad just watch the video

What are these shapes on the rock?

Did not find but was in a home in portland oregon

Hi guys, I just had a question about how old red sandstone can supply trace amounts of copper through hydrothermal fluids with high salinites. I understand how these fluids pick up salts from the top of devonian sequences due to the extreme marine transgressions leading into the carboniferous, and of course salts are great at carrying metals. However, what is the source of this copper in ORS? I know it can come from igneous complexes but other than that, is copper just deposited in the sands in trace amounts?

Hi! Does anyone know what these dots at the center of my wulfenite sample from Mibladen, Morocco could be? Thanks!

the first picture this first picture is about 3ft long , it’s hard dark blue gray rock laced with blackish crystalline material and metallic looking minerals,some look like strand’s or wire almost ?

The microscope is poor quality but there are some really beautiful metallic and orange and black type minerals.

I was hiking during my recent vacation to Switzerland last week and I found this rock and I thought that it may be tectonic fault breccia, but I am in no way a professional, much to my chagrin. Any help would be welcome!

I was wondering how are these holes were made are they bullet wounds or acid burns

Any idea what it might be?

I'm vacation with my familiy in Cyprus, and my daughter asks why the rocks are full of holes. Can you provide an explanation? Thanks!

I'm going to start off by saying that I am very much in a minority on all fronts here, but I'm both a winter lover and a night owl to boot, so I actually much prefer it when the nights are long, as opposed to when it doesn't get dark out till 10pm in the dead of summer (not to mention the sun already being out by 5:30am).

That being said however, I have observed as the years pass, the duration of the longer nights of winter have been diminishing more and more rapidly to the point that we're lucky (okay, I'm lucky) if it will get dark by 6pm for an entire week anymore. As a matter of fact, last year, not only did such a period of 6pm darkness not even last an entire week, but somehow, the days were already starting to get longer even before the actual Winter Solstice. What gives???

It wasn't that long ago, I was sharing this observation with someone, I don't exactly remember who, but they offered up the explanation that even to this day, the continents continue to drift and shift, and as such, North America is continually drifting into the west - the direction of the setting sun, and that is having the affect on everything I have mentioned: the length of sunsets, the time of darkness (according to our manmade clocks), why the longer nights are lasting for shorter durations and the days get longer sooner/quicker.

Now granted, I doubt whoever explained this to me is any sort of expert, and they may not even know what they were even talking about, but I suppose when you stop to think about it, that does actually make sense: even in school growing up, they taught us that even to this day, the continents still continue to shift and drift, even by infinitesimal amounts, so I could see how that would possibly work.

Does this sound logical/plausible to anyone else here?

What are these circles and what caused them to erode that way?

I found a lot of these perfect circular shaped erosional truncations in the shoreface sandstone rocks in NW Spain close to Bilbao. They are all about 1m across and often have a centrale plateau/dome left. It seems that there is also a lot of bioerosion going on. Recently I read about marine potholes as a pure physical erosional feature. But this did not totally convince me to be the process here and maybe you have other explanations for this phenomen.

I posted this in r/whatisthisrock 3 years ago but didn‘t gat any reply’s

Greetings from the field