The geological time period that encompasses the last 2.6 million years, characterized by the development of humans and significant changes in climate and environments.
चतुर्थकालीय युग
English Usage: The Quaternary era is notable for the evolution of modern humans.
Hindi Usage: चतुर्थकालीय युग आधुनिक मानवों के विकास के लिए प्रसिद्ध है।