The International Stratigraphic Guide

The International Stratigraphic Guide is a set of internationally agreed rules and standards for studying and organizing Earth's layered rocks, called strata. It helps geologists identify, describe, and classify these layers consistently worldwide, which is essential for understanding Earth's history, dating rocks, and correlating events across different regions. By providing a common framework, it ensures clear communication and accuracy in geological research and the construction of geological maps and chronologies.