The International Commission on Stratigraphy(ICS)has a long tradition of producing international charts that communicate higher-order divisions of geological time and actual knowledge on the absolute numerical ages of...The International Commission on Stratigraphy(ICS)has a long tradition of producing international charts that communicate higher-order divisions of geological time and actual knowledge on the absolute numerical ages of their boundaries.The primary objective of ICS is to define precisely a global standard set of timecorrelative units(Systems,Series,and Stages)for stratigraphic successions worldwide.These units are,in turn,the basis for the Periods,Epochs and Ages of the Geological Time Scale.Setting an international global standard is fundamental for expressing geological knowledge.It is also of considerable pragmatic importance as it provides the framework through which regional-scale higher-resolution divisions can be linked,equated and collated.This is a status update on the International Chronostratigraphic Chart and the ICS website www.stratigraphy.org.展开更多
Glacial deposits in locally-glaciated mountain regions are often expressed through their surface form and the study of these deposits constitutes a major branch of geomorphology. Studies of glacial depositional record...Glacial deposits in locally-glaciated mountain regions are often expressed through their surface form and the study of these deposits constitutes a major branch of geomorphology. Studies of glacial depositional records in mountain areas have often neglected formal stratigraphical procedure resulting in an ad hoc development of quasi-stratigraphical nomenclature. Here, a formal stratigraphical procedure is recommended, since this enables a systematic approach to the subdivision of glacial deposits in mountain regions. Moreover, such an approach facilitates, in some instances, the development of a formal chronostratigraphy that can be compared to regional and global geological time scales. This is important in locally-glaciated mountain regions where glacial deposits represent one of the most important records of cold stage environments. Given that glacial landforms represent a key component of the Quaternary record, maintaining a formal link between geomorphological and geological stratigraphical procedure is a fundamental requirement of a consistent and comparable stratigraphical framework.展开更多
文摘The International Commission on Stratigraphy(ICS)has a long tradition of producing international charts that communicate higher-order divisions of geological time and actual knowledge on the absolute numerical ages of their boundaries.The primary objective of ICS is to define precisely a global standard set of timecorrelative units(Systems,Series,and Stages)for stratigraphic successions worldwide.These units are,in turn,the basis for the Periods,Epochs and Ages of the Geological Time Scale.Setting an international global standard is fundamental for expressing geological knowledge.It is also of considerable pragmatic importance as it provides the framework through which regional-scale higher-resolution divisions can be linked,equated and collated.This is a status update on the International Chronostratigraphic Chart and the ICS website www.stratigraphy.org.
文摘Glacial deposits in locally-glaciated mountain regions are often expressed through their surface form and the study of these deposits constitutes a major branch of geomorphology. Studies of glacial depositional records in mountain areas have often neglected formal stratigraphical procedure resulting in an ad hoc development of quasi-stratigraphical nomenclature. Here, a formal stratigraphical procedure is recommended, since this enables a systematic approach to the subdivision of glacial deposits in mountain regions. Moreover, such an approach facilitates, in some instances, the development of a formal chronostratigraphy that can be compared to regional and global geological time scales. This is important in locally-glaciated mountain regions where glacial deposits represent one of the most important records of cold stage environments. Given that glacial landforms represent a key component of the Quaternary record, maintaining a formal link between geomorphological and geological stratigraphical procedure is a fundamental requirement of a consistent and comparable stratigraphical framework.
