Are my Pecan trees dead?

I can take some pictures tomorrow in the day time.

Some more detailed info:

I planted these trees along with a bunch of other saplings, all of which survived. They are all bare root. So I’m not sure how helpful the pictures will be. They are roughly 3 feet/1 meter tall.

I have the pecan trees, along with all the others, planted at the same level where the roots were. I just wonder if they spent too much time not in the ground. I read that they can be somewhat difficult to transplant.

The confusing part to me is that they still seem alive above a certain point. I just don’t know how if the bottom part is dead. And if the bottom part isn’t dead, why is all the outer wood at the base of the tree dead. Maybe it’s just a slow process. I can’t imagine them surviving like this, but I am pretty new to planting trees.