The smallest subdivision of geologic time, often marked by the appearance or disappearance of a specific fossil or rock formation. For example, the Holocene Age is the current epoch of the Quaternary Period and began about 11,700 years ago.
The smallest subdivision of geologic time, often marked by the appearance or disappearance of a specific fossil or rock formation. For example, the Holocene Age is the current epoch of the Quaternary Period and began about 11,700 years ago.