After I finished sawing his logs and was tallying up, the customer commented that this was the first time that he had ever had Post Oak sawed. I had to tell him, "Marvin, that was Cherrybark Red Oak, not Post Oak". He was surprised, embarrassed, and confused. "Show me the difference", so we had to take a walk and go to school.
The Red Oaks have pointy leaves, and Post Oak is in the White Oak family and has rounded leaves.

Now I'll be going back and sawing Post Oak for his trailer decking.