I'm thinking of doing an amalgamation of rammed earF walls with posts or columns of mortared rock. Just rearranging the dirt and rocks. And please,,, whatever you do, don't try this at home. And be carefull of looking it up on G. images or youtube. I just did and almost forgot to come back to finish this post. Ops I just did it again. 'rammed earth walls' on Gooogle images. They are the most beautiful walls I've ever seen.
Now I know the future! And it's real primitive.
Here is a sample of what others have done.
Don't get me started!