"The scientific study of sedimentary rocks and of the processes by which they were formed; the description, classification, origin, and interpretation of sediments." Glossary of Geology, 4th ed., American Geological Institute
body of expert stratigraphers founded for the purpose of promoting and coordinating long-term international cooperation and of establishing and maintaining standards in stratigraphy. (taken from ICS Statutes ratified by IUGS in 2002)
Produced by the University of California Museum of Paleontology, the Paleontological Society, the Society of Vertebrate Paleontology and the U.S. Geological Survey. Contains links to numerous resources which could be of interest to amateurs and professionals.
an international not-for-profit society dedicated to the dissemination of scientific information on sedimentology, stratigraphy, paleontology, environmental sciences, marine geology, hydrogeology, and many additional related specialties (taken from the website)