Geoff Duller, a professor of geography and Earth sciences at the ... He said the structure, excavated upstream of Kalambo Falls near Zambia’s border with Tanzania, probably would have been ...

"One is lying over the other and both pieces of wood have notches cut into them," said Geoff Duller, professor of geography at the ... of the Moto Moto Museum in Zambia, said: "I was amazed ...