ABSTRACT
According to Jung's account the germination of the theory came with a crucial dream he had on the 1909 trip to Clark University in America with Sigmund Freud. Carl Jung was ignoring the simple interpretation that culture and environment were the cause of the dream and using the material as evidence for his theory of a collective unconscious. Jung suggested that the unconscious more readily picked up the influences of the local 'the chthonic factor, the earth upon which one lives'. Jung's 'geological' collective unconscious included all levels of the psyche from the pre-mammalian universal depths, through the pre-historic racial layer to national groups in historic times and then the modern world with its family histories and personal experience. The layered model of the unconscious is important because of the way it reflects Jung's conception of history as progressive and moving through stages.
