Charles Hapgood, as author of Earth's Shifting Crust (1958), Maps of the Ancient Sea Kings (1966), and The Path of the Pole (1970), stands out as one of the 20th Centuries true visionaries.

In, Earth's Shifting Crust, Hapgood made the most significant statement ever published on crustal shift theory when he identified  FORCES  as the cause of the Ice Ages.    {ref. p 314}

Quote: The prospect that unfolds before us, as we contemplate the possibility that total displacements of the earth's crust have been a feature of geological history since the formation of the crust itself, is nothing less than the discovery of the formative force, the shaping factor, that has been responsible not only for ice ages, not only for the mountain ranges, but possibly for the very history of the continents and for all the principle features of the face of the earth!