Cool rock - my mind wouldn't go to dinosaur egg though.
It's a jasper lookin agate to me.
If a old large egg were to be petrified - I wouldn't expect the yolk to be perfectly preserved in its rounded state, suspended within the egg. The yolk would have turned to mush, and fallen to the bottom of the egg.
YA could sit on it for a while see if it hatches. Sorry had to go there that is pretty cool Ive never seen anything like it Good find thanks for posting it