quercus- oak. In the piney woods probably a post oak. Second leaf reminds me of slippery elm (just try to lop those branches and the darn thing cuts halfway across and then refuses to cut in two). Aw, I don't have my tree link on this computer...brb
The leaf looks like an Overcup Oak, which is a bottom land or stream side species.
There is a lot of variety in post oaks, so it could be Quercus stellata.
If it is growing on dry land I would guess from a distance that it is a post oak, (white oak family).
The elm is either winged elm (Ulmus alatta) or Cedar Elm, noted above. Both would be native in East Texas.