Help with this rock

[Treasure_Hunter]

Sorry, again all natural including the last two.

 

[Rzimm]

Hmm. Well then I digress. I’ll have to gain access to an archaeologist familiar with the prehistoric native Americans who were local. I’ll need more than opinions before I throw in the towel. However, if they are not...I may come back to brag a bit!

Thanks again!!

 

[Mine Shaft]

No artifacts, just rocks.