Definition

1. Proper noun:
   • A geologic period: The Upper Carboniferous is a subdivision of the Carboniferous period in the geologic timescale, occurring from approximately 310 million to 280 million years ago. It is characterized by a warm climate and extensive swampy land environments.

Usage

• The term "Upper Carboniferous" is used primarily in scientific contexts, specifically in geology and paleontology, to refer to this specific interval of Earth's history.
• It is often discussed in relation to the formation of coal deposits, the evolution of early reptiles and insects, and the paleogeography of the supercontinent Pangaea.

Examples

• Proper noun:
  • The coal seams in this region were formed during the Upper Carboniferous.
  • Fossils of giant dragonflies are commonly found in Upper Carboniferous strata.

Advanced Usage

• In formal stratigraphy, the Upper Carboniferous is approximately equivalent to the Pennsylvanian subperiod in the North American system.
• The term is used to describe rock layers (systems), the time span (period), and the events that occurred during that time.

Variants and Related Words

• Pennsylvanian (proper noun): The North American term for the geologic subperiod corresponding to the Upper Carboniferous.
• Carboniferous (proper noun): The broader geologic period (359-299 million years ago) which contains the Upper Carboniferous as its later part.
• Lower Carboniferous (proper noun): The earlier subdivision of the Carboniferous period, approximately equivalent to the Mississippian subperiod.

Synonyms

• Late Carboniferous: A less common but synonymous term.
• Pennsylvanian Period/Subperiod: The direct synonym in the North American stratigraphic system.

Related Phrases

• Upper Carboniferous coal measures: Refers specifically to the coal-bearing rock formations from this period.
• Upper Carboniferous flora/fauna: Describes the plant and animal life characteristic of this time.

Noun

1. from 310 million to 280 million years ago; warm climate; swampy land