Home
Fossils and Earth's Past

Era

Era Definition

Era Definition (no text)

Era definition: The second-longest unit of geologic time, it is divided into periods.

Related Terms

Learn While Gaming

How GameSmartz works video thumbnail

GameSmartz (Beta)

FAQ Privacy Cookies Terms

© 2026 GameSmartz

Data Sources: Bureau of Labor Statistics (BLS) - https://www.bls.gov

Data Sources: Learning and Cognition Technologies (LC) - https://www.nsf.gov

Data Sources: US Patent and Trademark Office (USPTO) - https://www.uspto.gov