the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape 
                                                            
                                                     
                        
                                                
                        
                        
                            The process by which organic material is substituted with rock, thereby making a stone copy of the original.
                                                            
                                                     
                        
                                                
                        
                        
                            The process of changing organic matter to rock, called permineralization.