7 3/4 Inch Cleoniceras Ammonite With Douvilleiceras

This is a really cool ammonite association. There is a huge (7.7 inch wide) Cleoniceras cleon ammonite with a 2 1/2 inch Douvilleiceras mammilatum ammonite "riding" on it. I've never seen these two ammonites associated together in a single display.