Before revision: Vertebra of Europasaurus being prepared out of the rock Fossil preparation is the act of preparing fossil specimens for use in paleontological research or for exhibition, and involves removing rocky matrix surrounding them and cleaning them up .
After revision: Vertebra of Europasaurus being removed from the rock matrix Fossil preparation is the act of preparing fossil specimens for use in paleontological research or for exhibition, and involves removing the surrounding rocky matrix and cleaning the fossil .