Phanerozoic
Noun 1. The Phanerozoic Eon: The current geological eon in Earth's history, spanning from approximately 541 million years ago to the present day. It is characterized by the abundant evidence of visible, complex life forms in the fossil record. The name derives from Greek roots meaning "visible life."
The term "Phanerozoic" is used as a proper noun to refer to the major division of geologic time. It is almost always capitalized. * It functions as a noun, most commonly appearing as "the Phanerozoic" or "the Phanerozoic Eon." * It is used to discuss broad patterns in the history of life, climate, and geology on Earth.
- Noun:
- The diversification of multicellular life marks the beginning of the Phanerozoic.
- All known complex animal life has evolved during the Phanerozoic Eon.
- Geologists divide the Phanerozoic into three eras: the Paleozoic, Mesozoic, and Cenozoic.
- "Phanerozoic" as an adjective: While primarily a noun, it can be used attributively to describe rocks, fossils, or events from this eon.
- The study focuses on Phanerozoic climate change.
- These are Phanerozoic sedimentary rocks.
- Phanerozoic Eon: The full, formal name.
- Precambrian: The collective term for all geologic time before the Phanerozoic Eon, characterized by a less visible fossil record.
- Visible Life Eon: A direct, descriptive translation of the Greek roots (less common).
The word "Phanerozoic" has a single, specific meaning in geology and paleontology. It does not have idiomatic meanings or common usage outside this scientific context. It refers exclusively to the geologic eon of visible life.
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the period from about 5,400 million years ago until the present
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