R2elk
Deeply Rooted
I had a garden in at least a 20 year old sawdust dump. When it dried, it was powder. There was no cracking at all. It produced the best potatoes and tomatoes that I have ever grown.To me the one on the left looks like the surface cracking you'd get in a soil relatively high in organic matter, especially if it doesn't get that hard when it dries. If you soak sawdust and let it dry I'd expect the surface to look a lot like that.