This one has to be the most unusually Pen Jing. I have never seen any thing like this before.
This tree is quite big at perhaps 4 or 5 feet tall. It was originally one tree, but seems someone split the tree exactly in the middle, then each half moved away from the other half and continue to grow with some branches extending to the other side.
Three Chinese character "勒馬崖" was craved on the inside flat face of one half of the tree. The Chinese writing literally means the cliff where you have to hold back your horse. I think it's describing the sheer straight sharp drop of the cut.