Pausanias Description of Greece 1.40.4

[4]
  After this when you have entered the precinct of Zeus called the Olympieum you see a note worthy temple. But the image of Zeus was not finished, for the work was interrupted by the war of the Peloponnesians against the Athenians, in which the Athenians every year ravaged the land of the Megarians with a fleet and an army, damaging public revenues and bringing private families to dire distress. The face of the image of Zeus is of ivory and gold, the other parts are of clay and gypsum. The artist is said to have been Theocosmus, a native, helped by Pheidias. Above the head of Zeus are the Seasons and Fates, and all may see that he is the only god obeyed by Destiny, and that he apportions the seasons as is due. Behind the temple lie half-worked pieces of wood, which Theocosmus intended to overlay with ivory and gold in order a complete the image of Zeus.

[4] After this, as one enters the precinct [ temenos] of Zeus called the Olympieion, there is a temple [ nāos] of his there that is worthy of viewing [ théā]. But the statue [ agalma] of Zeus was not finished, for the work was interrupted by the war of the Peloponnesians against the Athenians, in which the Athenians every year ravaged the land of the Megarians with a fleet and an army, damaging public revenues and bringing private families to dire distress. The face of the statue [ agalma] of Zeus is of ivory and gold, the other parts are of clay and gypsum. The artist is said to have been Theokosmos, a native, helped by Pheidias. Above the head of Zeus are the Seasons and Fates, and all may see that he is the only god obeyed by Destiny, and that he apportions the seasons as is due. Behind the temple lie half-worked pieces of wood, which Theokosmos intended to overlay with ivory and gold in order a complete the statue [ agalma] of Zeus.