trias

A paleontologist carefully examines a trias fossil in a rock formation.

Definition

1. Noun (Geology):
   • Triassic period: "trias" refers to the earliest period of the Mesozoic era, spanning from about 251 to 201 million years ago, characterized by the emergence of dinosaurs and the breakup of the supercontinent Pangaea.
   • Triassic system: The rock strata and geological formations deposited during this period.

Usage Examples

• (The Triassic period saw the rise of early dinosaur species.)
• (The Triassic period is examined for its biological and environmental changes.)

Advanced Usage

• "trias" as a geological term: It is often used interchangeably with "Triassic period" in formal scientific writing.
  • The trias ended with a mass extinction event that paved the way for the Jurassic period. (The conclusion of the Triassic period marked a significant ecological shift.)

Variants and Related Words

• Triassic (adj): relating to the trias period or its rock formations.

  • The Triassic rocks contain fossils of early reptiles. (The adjective form describing the period or its strata.)

• Triassic-Jurassic boundary (n): the transition point between the Triassic and Jurassic periods.

  • The Triassic-Jurassic boundary is marked by a distinct change in fossil assemblages. (A specific geological horizon.)

Synonyms

• Triassic period: the full name for the trias.
• Mesozoic era's first period: a descriptive phrase for the trias.

Related Idioms

• No common idioms are associated with "trias," as it is a specialized scientific term.