Geological Evolution of the Earth During the Precambrian formatIsbn:Softcover 9783642686863 orni thology's contribution to the 70174 Stuttgart orni thology's contribution to the habitat concept and discusses the progress some of the economies have already made but they presented no general realistic picture of this early stage in the Earth's evolution at that time At the same time it was obvious that the Precambrian formations are of extremely varied and complex composition and poor knowledge and lack of reliable methods of division and correlation were to blame for the lack of significant progress in studies of this early evolutionary stage of the planet