unknown stone in Ukrainian Carpathian

First off I will say that's some pretty country you have there. Second video isn't like being there, the camera hides some things and enhances shadows to look like others. I'm on the fence here, so here is my opinion.

I'm going to agree with Seldom to a point. Much of what I see are natural rock formations, but... some have been obviously modified. Question is by whom. The round holes horizontally into the rock (although I have seen nature do this with volcanic basalt usually the size will vary) look artificially placed to me, much like drill holes for blasting and could be modern in origin.

The squarish rocks can and do happen naturally. Sometimes they will even stack looking very manmade. Some of them do appear worked, but it's not clear in the video. If there were straight lines of wall with a semi uniform thickness I would be more inclined to believe they were artificial.

The sarcophagus stone, while it looks symmetrical in the first pictures is not from the reverse angle. While there is an obvious void I wouldn't assume it's a manmade cavity. I'd use a remote camera to investigate if there is enough evidence to support a closer look inside.

The marks on the back look like a mix of natural rock formation with possibly enhanced grooves. Just can't make out if it's chiseled or eroded from the film. The fracture in the stone that forms the lower inclination looks too much like a natural formation to me. Perhaps doing some charcoal rubbings would make the impressions better visible to the camera?

The one thing that really grabs me and says it could be ancient is the catch basin rock. The 4 grooves lead to the center so it seems to me to be a collection point. After looking at the vid and the dark discoloration to the top I'm wondering if there is any vitrification on the top of the rock? Could it have been used as a foundry to extract metal from ore? My other thought is still a religious use. The natural ampitheatre effect of the megalithic rock formations suggest that to me. It looks too rough to be roman to me but that's a bit out of my area to really say. Just my impressions, thanks for sharing your videos

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This one could be interesting So I'm keeping an eye on it 

All the best
Xavier

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Xavier

Thank for your extensive comment and researches of a video.
The marks on a cover of sarcophagus remind to me a leg of an animal (and craws). And the second trace from attempt to blow up a cover of sarcophagus.
All these stones - not basalt. Most likely it песчаник. Therefore two apertures of a not natural origin. In documentary film of German archeologists such apertures were made for its transport.


The very first stone with 4 pathes has inside cavity. Top radius of this cavity is less than average radius. And consequently this stone could not be used as the form for moulding metal. But as the furnace for плавления of metal from ore - yes.
Excuse for mine bad English. I do not know well English. But I could understand all your statements.
Unfortunately I have not such thin videocamera to investigate a cavity of a sarcophagus ...
Once again - many thanks.

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Just use your cell phone. Make a bracket of some sort then put it on video, slide it in the cavity with an LED for light and there you go.   

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Xavier

Wus47, I am not an expert on this but have some knowledge of Geology, Petrology and Mineralogy. It came from studying the subjects in school and from various field trips around America. From what I do know the comments of Idaho Jones agree pretty much with what I think. I will say this though.
While the 'sarcophagus' stone looks like a natural fracture. The first test one should apply in determining if it is man made or natural is to trace minerals or inclusions in the rock from top to bottom across the crack. If the inclusions in the rock line up from top to bottom it is a natural crack. If they don't then it could be man made but not necessarily. The two halves could have shifted naturally.
On the last feature which resembles a foot print or bear claw print, there are a number of natural explanations. First that it is a bear claw print laid down in soft mud or clay and lithified, that is a fossil footprint. This is not very likely and can be ruled out if the stone is granite, volcanic or anything but sedimentary in origin. ie sandstone, mudstone, limestone or siltstone. Even if it is sedimentary, it may be a fossil imprint of vegetation (wood) or bone. The most likely natural cause is an imprint left by a mineral. This occurs in all types of rocks. A mineral such as calcite forms crystals in shale and is later dissolved by ground water leaving a void or called 'vug' if it is large. Feldspar does this in granite. The way to identify an impression of a mineral crystal is to look for crystal shapes. ie sharp corners and angles. Voids formed by water may not show any evidence of fossil or mineral origin. Once water starts flowing through a crack in a rock it may dissolve out a smooth rounded cavity. Think limestone cave. This happens in granite too.
All of the surface features of these rocks including the pocket with the four grooves are consistent with and similar to natural features I have seen in the Appalachians and Rocky Mountains in the U.S. Of course none of this means that the features were not man made. If you think they are Roman I suggest you get a metal detector and look for Roman coins around them. Gambol

I translated this and the Russian word песчаник.  came out Sandstone. Is this correct?

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