We all have within us a chaotic past which has been a huge part of our lives. Spiritual progress, however, dictates that we understand that this part can be changed and our present selves can grow from that ability to change. Old standards are now extinct and will no longer stand up to scrutiny. We are in touch with an archaic or outmoded part of ourselves. Remembering that dinosaurs are extinct, and that for most people they are perceived as fossils, such a dream can recognize the part of ourselves that has become set in stone. When we dream of monsters or prehistoric animals we are touching into very basic images which have the power to frighten and amaze us. Because they are considered to be so large, we need to be aware of whether it is their size or their power which is frightening. Urges as basic as this can threaten our existence, by either their size or power. You might also like to consult the entry for Prehistoric.