The large variation of natural remanent magnetism (NRM) limits the use of NRM as a diagnostic tool in making time correlations. Each unit of a given rock sequence will be either normally or reversely oriented. Because of the natural variance of NRM intensity, any such sequence will appear identical with one of two possible theoretical binary (i.e., two-valued) series. This fact greatly enhances the possibility of making faulty time correlations between widely differing sequences.
Figures & Tables
The general theme of this publication is the assessment and reassessment of various data, observations, and ideas about the earth as they relate to the concept that has come to be known as plate tectonics. Much widely scattered material was brought together for this publication, and its 24 papers contain an abundance of worldwide references that are important in studying plate tectonics.