Blackjack and Post oaks are trees that form open forests in higher, dryer sandy areas of the region and state. Upland sandy soil areas are often inhabited by post oak and blackjack trees as you see along this narrow corridor. The open field south of the fence was likely once dominated by these two oaks. Post oaks and blackjacks do not often form dense canopies like live oaks and other riparian trees. Grasses, briars, and low brush can survive in this more open woodland setting. Mature post oaks and blackjacks have thick bark to help them survive wildfires.