Pausanias Description of Greece 1.44.7

[7]
  There are legends about the rocks, which rise especially at the narrow part of the road. As to the Molurian, it is said that from it Ino flung her self into the sea with Melicertes, the younger of her children. Learchus, the elder of them, had been killed by his father. One account is that Athamas did this in a fit of madness; another is that he vented on Ino and her children unbridled rage when he learned that the famine which befell the Orchomenians and the supposed death of Phrixus were not accidents from heaven, but that Ino, the step-mother, had intrigued for all these things.

[7] There are tales told with regard to those [white] rocks [ petrai] that become ever more elevated as the road narrows. One of these [elevated white rock formations] is a rock called Molouris, and it is from here, they say, that Ino threw [ rhiptein] herself into the sea while holding Melikertes, the younger of her children. Learkhos, the elder of them, had been killed by his father. It is said by some that Athamas did [ drân] this in-a-state-of-madness [ manēnai]; but others say that he vented on Ino and her children his uncontrollable rage [ thūmos] when he learned about the famine [ līmos] that befell the people of Orkhomenos and about the death—as he supposed—of Phrixos. He [= Athamas] supposed that all the things happened not because of divine power [ tò theion] but because of plotting by Ino, the stepmother.