Black birch is heavy and oak doesn't have that smooth, flaky bark. It's one of my favorite firewoods because its high in BTU's and it not messy in the house. Had two cords one winter.Heavy to me means something like oak, hickory, or locust.
The bark is making me draw a blank. But I'd guess some type of oak, not chestnut oak, but the wood looks like chestnut oak.