Passage 8.42.13
τῶν δὲ ἐντυχόντων ἡμῖν ἔλεγεν ὁ πρεσβύτατος γενεαῖς πρότερον τρισὶν ἢ κατʼ αὐτὸν ἐμπεσεῖν ἐς τὸ ἄγαλμα ἐκ τοῦ ὀρόφου πέτρας, ὑπὸ τούτων δὲ καταγῆναι καὶ ἐς ἅπαν ἔφασκεν αὐτὸ ἀφανισθῆναι· καὶ ἔν γε τῷ ὀρόφῳ δῆλα καὶ ἡμῖν ἔτι ἦν, καθὰ ἀπερρώγεσαν αἱ πέτραι.
The oldest among our guides informed us that three generations before his own time rocks had fallen from the roof onto the statue, shattering it and causing it to be completely destroyed. And in fact on the ceiling we too could still clearly see the places from which the stones had broken away.