big surface boulders from all rock layers under them

[Topminator]

A suggestion for spelunking for rock, having a big 2x2 or 3x3 boulder (not raw rock but a boulder) and have it have a chance to be made of the rock from all lower layers would be a good and immersive way to know what rock is below without digging a hole deep enough

[Bumber]

But how did it get to the surface?

[VaelophisNyx]

On 9/30/2023 at 2:55 AM, Bumber said:

But how did it get to the surface?

this is actually fairly common IRL! especially if anywhere even remotely close to the area it's in has exposed rock hills or mountains that result from some rapid upheaval. They tend to crumble and over time slide down hill with mud during rain, though often they sink into the soil.

[Owktree]

Deeper rock is deeper rock.  Exposed higher rock (which may or may not be the same type as the lower rocks) will erode down by the various geological transport methods.  You can see that in various hilly regions of a world where the hills can be another set of igneous and sedimentary rocks, possibly reduced to gravel and sand, sitting on top of another set of rock layers which can be basalt, sedimentary, and igneous rocks in their own set of layers.

The question of how a sample of a lower lower layer got transported upward to be some boulders on the surface is a valid one if it's not the uppermost surface layer that is currently being exposed by erosion or other processes.  (Assuming, of course, that geologic processes similar to IRL are in action.)

[Edit:

And to answer the question of how deeper boulders might get the surface in a way that IRL does not have.  The past upheaval in the world that led to the odd geography, buried ruins that can be unnaturally entombed in solid rock, etc. could have also displaced limited amounts of deeper rocks to points that are now exposed on the surface.]

Edited October 1 by Owktree

[Maelstrom]

Additionally, does anyone else find it curious how common suevite deposits occur?  Seems like some of the catastrophe that happened wasn't limited to just the planet, but also (at least) it's near vicinity in space.

[Owktree]

Impacts are sort of odd compared to how they are in IRL.  Pretty high mass/size for the depth of the crater, but still are creating suevite stone which implies a pretty high speed/energetic impact.  Possibly a case where the interdimensional catastrophe created all sorts of odd effects.  (handwave here)