Definition

1. Proper noun:
   • A geological period: The Permian Period is the final period of the Paleozoic Era, spanning from approximately 299 million to 252 million years ago. It is known for the diversification of reptiles and ended with the Earth's most severe known mass extinction event.

Usage

• The term "Permian Period" is used as a proper noun to refer to a specific, defined interval in Earth's geological history. It is always capitalized.
• It is commonly used in scientific, academic, and educational contexts related to geology, paleontology, and Earth's history.

Examples

• Proper noun:
  • The continents were merged into the supercontinent Pangaea during the Permian Period.
  • Fossil records show that synapsids, the ancestors of mammals, became abundant in the Permian Period.
  • The mass extinction at the end of the Permian Period wiped out approximately 90% of marine species.

Advanced Usage

• "Late/Early/Middle Permian": These terms subdivide the period into more precise geological epochs.
  • The climate became increasingly arid during the Late Permian.
• "Permian-Triassic boundary": Refers to the geological boundary marking the end of the Permian Period and the beginning of the Triassic Period.
  • The rock layer at the Permian-Triassic boundary contains evidence of a catastrophic event.

Variants and Related Words

• Permian (adj): Of or relating to this geological period.
  • Permian rocks are rich in fossil fuels in some regions.
• Permian Basin (proper noun): A major sedimentary basin in the US, named for the Permian-age rocks it contains.
• Guadalupian, Lopingian (proper nouns): Formal names for the middle and late epochs of the Permian Period, respectively.

Synonyms

• The Permian: A common shortened form used in technical contexts.
  • The climate of the Permian was highly variable.

Related Phrases

• "End-Permian extinction": A specific phrase referring to the mass extinction event that concluded the period.
  • The causes of the end-Permian extinction are still actively researched.
• "Permian reef": Refers to the extensive fossilized reef systems, like the Capitan Reef, deposited during this time.
  • The Permian reef complex in Texas is a world-famous geological formation.

Noun

1. from 280 million to 230 million years ago; reptiles