This Specimen is a polished and stabilized fragment of a full ammolite fossil. This piece is considered to have "dragon skin" pattern with the cracked looking surface. These are generally found deeper within the pit mine and are more compressed. This piece has bright varying color and is a great specimen from the locality.
These fossil ammolites are around 70 million years old & these particular ammonites are among the few sources that produces such spectacular brightly colored specimens and gem quality pieces