The Grey Sauble Conservation Authority says it's shocked by recent vandalism committed at a conservation area near Owen Sound.
A post on Facebook shows the extent of the damage at Jones Falls & Pottawatomi Conservation Area, including messages spray-painted onto rock formations that are millions of years old.
The authority says it is disheartened that someone would deface such a unique natural area.
Anyone with information on this crime is asked to contact the Ontario Provincial Police.