geological period

Found in Anh - Anh (Wordnet)

Definition Noun : A major division of geological time : A "geological period" is a fundamental unit of the geologic time scale, representing a span of time during which a specific system of rocks was formed. It is a subdivision of an era and is itself subdivided into epochs. Usage The term "geological period" is used to discuss Earth's history in a formal, scientific context. It refers to a spe...