A. Composed of ancient rock
B. Parallel to wind direction
C. Long and narrow
D. Steep sides and knife-like tops
A self-dune is a type of sand dune, and it is characterized by being composed of sand. Therefore, the feature NOT associated with a self-dune is that it is composed of ancient rock. The other characteristics mentioned (B. Parallel to wind direction, C. Long and narrow, D. Steep sides and knife-like tops) are typical of sand dunes.