That doesn't look to me like Oak, however. Sugar Maple, possibly? If so, that's as good as Red Oak! I see some leaves lying around....got any that are definitely from that tree?
agreed looks more like maple to me also.. still great score! But I don't see a lot of oak.. in my valley, lots of maple ash cherry
Those buggers can bounce and fly a bit! If there are other trees nearby... If you split it soon, update us with some split pics.