Heavy rain in North Otago set off a major rockslide blocking the entrance to one of the country's best known rock art sites.
Amanda Symon from the Ngai Tahu Maori Rock Art Trust says the limestone cave has been fenced off
Waatea News reports some of the drawings at Takiroa near Duntroon on State Highway 83 probably date back to the earliest Maori settlers in Aotearoa.
There are also post-contact drawings of boats and horses.
Ms Symon says the outcrop itself could be quite vulnerable and geotechnical investigation will be needed, but the rock art itself, is quite stable.
More than 25,000 people per year visit Takiroa.