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I have recently stumbled across this video on Youtube, where quite a magnificient building is carved into the soil with simple tools like a shovel and hoe. The location is somewhere in South America, according to the channel description.

The rock seems to be (easily) workable, but also stable enough to maintain smooth surfaces and carved shapes.

See this picture for reference: enter image description here

What kind of soil/rock is this?

Edit: There is no need to watch the whole video. The reference image pretty much sums up what is going on, and what's the basis of my question respectively, at least in my opinion.

Edit 2: As John pointed out in the comments, at one point the soil is mixed with water to make a clay plaster.

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    $\begingroup$ Possibily loess $\endgroup$ – Fred Jun 12 '20 at 19:48
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    $\begingroup$ Plinthite can harden irreversibly into ironstone, and laterite has been cut into bricks and used for construction for a long time. There are definitely massive plinthite regions in South America. I haven't figured out where they are, or found well attested excavations into plinthite in South America, and I'm a little suspicious that their pool was downhill of a river but not below the water table, but very rigid reddish soils do definitely exist. $\endgroup$ – cphlewis Jun 12 '20 at 21:12
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    $\begingroup$ Loess is a periglacial aeolian sediment. I haven't watched the video, but superficially judging from the guys i'd side be with @cphlewis, until we know where the hell that is. Pls. op be more specific and write a few sentences about where and what that is and where you have already looked for information. Assume that some people don't use up their time to watch youtube videos, like questioneers don't use up their time to be more specific ;-) $\endgroup$ – user20217 Jun 14 '20 at 11:16
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    $\begingroup$ It is not rock, likely it is a well consolidated clay rich soil. in fact in one scene you can see them breaking it up and adding water to make a clay plaster to lock bamboo lats in place. $\endgroup$ – John Jun 15 '20 at 1:12
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    $\begingroup$ I don't understand why this has been closed for lack of clarity. There is a video with a type of soil, the OP wants to know if it can be identified. Seems pretty clear to me... $\endgroup$ – Jean-Marie Prival Jun 16 '20 at 7:22