Read this: Inscriptions have been found beneath many of the rock paintings, but archaeologists have so far been unable to decipher this form of ancient writing. During the Stone age, the Doian culture and the Hargeisan culture flourished here with their respective industries and factories.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): During what period did the Doian culture thrive?
the Stone age