Drywall that had been removed. (These rooms were drywall, not plaster - HALLELUJAH!!)
I don't have a good "after" of our bedroom, so this will have to do. It's the room through that doorway. Lee still has to remove the studs from the wall that was separating the rooms. It's extremely load bearing though so he's still thinking through that one.
You can see the holes in the floor where the wall in the middle of the two small rooms was removed.