Chronostratigraphy and Biostratigraphy

Abstract
Comments are given on a number of papers dealing with principles and procedure in stratigraphic classification which have appeared in British journals during 1963bodies of rock strata characterized by certain palaeontological features and bounded by the limits of known occurrence of such featuresbodies of rock strata characterized by representing the rocks formed during certain time-spans of earth history and bounded above and below by isochronous surfaces. Biostratigraphic zones and the chronostratigraphic terms chronozone and stage are discussed.