Triassic

Definition

A geological period spanning from approximately 252 to 201 million years ago, characterized by the dominance of archosaurs and the diversification of early mammals.

Etymology

From Latin *trias*, meaning 'three', referring to the three major groups of rock strata that define the period.

Example

The Triassic period saw the evolution of dinosaurs into their dominant forms.

Related Terms

• Mesozoic
• Paleozoic
• Jurassic
• Jurassic Period