Describes the stratigraphic series of each of the structural elements of western Greece. From west to east these elements comprise the Paxos zone (marginal to the stable Apulian block), the Ionian trough, the Gavrovo fold, the Pindus trough, and the sub-Pelagonian zone (marginal to the Pelagonian ridge). Orogenic activity began in lower Cretaceous time in the fundamentally unstable Pelagonian ridge and progressed westward toward the continental (cratonic) Apulian block. The Pindus trough was a eugeosyncline (with ophiolites), the Ionian trough a miogeosyncline (without ophiolites); the Pelagonian and Gavrovo ridges are sialic.