The Gondar city in Ethiopia was recognized by UNESCO as a World Heritage site in 1979. As for "ghibbe fossils," it seems there might be some confusion as there's no accurate information about such fossils. However, the earliest known fossil site in Ethiopia, the Lower Omo Valley, was recognized by UNESCO as a World Heritage site in 1980.
The Ghibe Fossils site and Gondar were recognized by UNESCO as World Heritage Sites on September 26, 1978.
