The External Relations Committee is responsible for Geological Society adherence to IUGS (the International Union of Geological Sciences). IUGS is the umbrella body for national geoscience societies. It supports and sponsors the IGC (International Geological Congress) meetings held every four years.
Visit the IUGS website
Visit the website of the 34th IGC and 35th IGC
The IUGS is a member of ICSU (the International Council for Science), along with the other international scientific unions. ICSU also has national members, usually the principal scientific academy or research council of a country - in the UK's case, the adhering body is the Royal Society.
Visit the ICSU website