Just googled it as I never heard of a post oak tree

White Oak vs Post Oak
These two white oaks are easily confused when found growing together in dry habitats, as white oak often exhibits a similar growth habit to post oak under these conditions. Most trees can be distinguished at any time of year by differences in leaf shape, texture, and presence or absence of pubescence on twigs and buds. White oak has a broader range of habitat preferences, whereas post oak is restricted to dry habitats with poor soil, and can tolerate even harsher sites. The two species can and do hybridize, so it may not be possible to identify all individuals.

So according to this a post oak is a type of white oak?

Persimmon

Yes, Quercus stellata is a white oak but Quercus alba is white oak if you get where I'm going.
Oak are usually classified by white oaks (Leucobalanus subspecies) and red oaks ( Erythrobalanus subspecies). White oaks have more lobed leaves without barbs or points on the ends, red oaks have the more pointy leaves.
Within each are various white oak species, red oaks, black oaks and chestnut oaks.

Q. alba, white oak, is a large tree that likes good spoils. Post oak, Q,stellata, is a smaller tree and likes the sandier , poorer soils.
White oak acorns are more favored by wildlife also, red oak acorns are bitter tasting. Chestnut oak falls into the white oak side.

Persimmon is very possible if those trees grow there. Bark looks similar.
Twig pic would really help, with the buds on it.

I just spent a couple hours cutting up some persimmon for smoker wood. Would be more certain with pics of the small twigs, but that trunk bark sure looks like the bigger persimmon logs I was cutting up.
My vote is a good sized persimmon.

I planted some american persimmons about 30 years ago and that pic sure looks like their bark alright.

Wish we could grow those & hedge apple here

Sweet Gum I believe.There was an old Hangin' tree back in the Ouachita Mountains where an old local hunter in Arkansas use to show it to me when I trapped down there. he said it was a Sweet Gum. Sure looked like that rough bark on that tree.

It’s a gum tree. Ours in Pa. get a black seed that falls in late summer.

Black gum ( Tupelo )

Not walnut or ash. I know those. There are post oak in the area.

I agree with Bigbrownie,
And they are very hard to split with a axe.

To my eyes, your picture does not look like Gary's picture at all. (No offence meant. Just opinion.)

Looks like the Gum I have seen here in PA.

Tupelo trees are usually found in, or very near water. They have a very soft wood which is preferred by several carvers I know. I don't think that is tupelo.

Black gum is used for making bowls around here often.

Look around the ground near the bottom of the tree for last years leaves.

That looks identical

I dont know if they are in your area Gary, but it looks like a flowering dogwood.