Bad or great area depending on perspective, post oaks leaves resemble a cross, but we have variations. The water oak, Q nigra is the only one I am sure of. All native sandy loamed dry creek area.
Porkpal, the tips of those leaves in 2& 3 shouldnt have tips. However, sometimes here smaller leaves near the ground camo themselves to protect from predation. I will have to go look at the trees in question again. My thumbnails weren't good shots. The one in the air is 20' above ground, cant get closer. White oak group, okay.