Hello, here is a Big! 100% natural and very RARE Utah Dinosaur Gastrolith, Gizzard stone or Stomach Stone! It is from the old Ernest Shirley collection out of Hanksville Utah and was found many years in the Morrison Formation on the high desert, Colorado Plateau in Southeast Utah.
This "rock" was IN a living dinosaur during the Jurassic era a Crazy! 201 to 145 million years ago.
The stone measures around 7.43cm or 3" at its biggest or from opposing side to side!