Basically, these techniques are merely designed to make it easier for the individual to achieve the out-of-body state when his brainwave pattern and personal energy levels have reached a point that he is in apparent harmony with his surrounding electromagnetic environment such that he feels that he has reached the threshhold where separation is a possibility.
It is thought that the Chuckanut Formation shoreline was of riverine environments combined with a large scale “bedding plane” of material deposition.