Red elm has thicker bark than this. It might be some other variety of elm, but that first picture is indeed odd. I've never seen contrast like that. There are a bunch of elm varieties, so I don't rule that out. Hmmm...My guess would be Elm. I think all we have here is slippery elm, (red elm same??). I haven't split it, but I've heard its pretty difficult; supposed to be good wood though.
Yes you guys are on the mark with it being Hickory; I can see some fungus growing on the flush "cut" side which is what happens with Hickory as well as Oak for some reason. Great stuff-possibly Mockernut Hickory. Good ID job guys!