Ralph the Indianapolis speedway got the name the brick yard because it was paved with 3.2 million 10 lb bricks after it was first constructed. the Idea and inital construction dates back to 1906 the first races were ran in I think June of 1909 it wasn't until 1911 when the first 500 mile race was ran it wa won by a Marmon car the predecessor to the Marmon trucks I don't know when it was finally paved over with asphalt.
but yes all of the layers shown in the picture are on top of the bricks