After Cyzicus had been duly mourned and buried, the Argonauts proceeded along the coast of Mysia, where occurred the incident of Heracles and Hylas.
It included Mysia, Lydia, Caria and Phrygia, and therefore, of course, Aeolis, Ionia and the Troad.
Mt Dindymus (Murad Dagh) marked the frontier of Mysia, and the entire valley of the Tembrogius or Tembris (Porsuk Su) was certainly included in Phrygia.
The Hermus drains a small district included in the Byzantine Phrygia, but in earlier times assigned to Lydia and Mysia.
Devonian fossils have been found near the Bosporus and Carboniferous fossils at Balia Maden in Mysia.