What is "coursed rubble"

Rubble \Rub"ble\, n. [From an assumed Old French dim. of robe See Rubbish.]

1. Water-worn or rough broken stones; broken bricks, etc., used in coarse masonry, or to fill up between the facing courses of walls.

   Inside [the wall] there was rubble or mortar.
   --Jowett (Thucyd.).

2. Rough stone as it comes from the quarry; also, a quarryman's term for the upper fragmentary and decomposed portion of a mass of stone; brash.
   --Brande & C.

3. (Geol.) A mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock.
   --Lyell.

4. pl. The whole of the bran of wheat before it is sorted into pollard, bran, etc. [Prov. Eng.]
   --Simmonds.

   Coursed rubble, rubble masonry in which courses are formed by leveling off the work at certain heights.