Chronostratigraphy is the branch of stratigraphy that studies the age of rock strata in relation to time. The ultimate aim of chronostratigraphy is to arrange the sequence of deposition and the time of deposition of all rocks within a geological region, and eventually, the entire geologic record of the Earth. The standard stratigraphic nomenclature is a chronostratigraphic system based on palaeontological intervals of time defined by recognised fossil assemblages biostratigraphy. The aim of chronostratigraphy is to give a meaningful age date to these fossil assemblage intervals and interfaces. Chronostratigraphy relies heavily upon isotope geology and geochronology to derive hard dating of known and well defined rock units which contain the specific fossil assemblages defined by the stratigraphic system.
ICS - Chart/Time Scale
Volume 23 Issue 3 March Article, pp. Both parallel sets of units are retained, although there remains the option to adopt either a single i. Geochronology can also qualify rock bodies, stratified or unstratified, with respect to the time interval s in which they formed e.
GSA Today Archive
Chapter 9. Chronostratigraphic Units A. Nature of Chronostratigraphic Units. Chronostratigraphic units are bodies of rocks, layered or unlayered, that were formed during a specified interval of geologic time. The units of geologic time during which chronostratigraphic units were formed are called geochronologic units.