"Age Pacific" Is Not a Geological Term—Likely Confusion with Mesozoic or Cenozoic
"Age Pacific" is not a recognized geological time period. The description provided (252.17-66 Ma, "Age of Dinosaurs," Pangaea breakup, Rocky Mountains rise, dinosaur extinction) actually describes the Mesozoic Era—specifically combining Triassic, Jurassic, and Cretaceous periods.
Correct Geological Time Scale (Relevant Segments)
| Eon | Era | Period | Age (Ma) | Key Events |
|---|
| Phanerozoic | Mesozoic | Triassic | 252-201 | Pangaea intact; first dinosaurs, mammals; end-Permian extinction recovery |
| | Jurassic | 201-145 | Pangaea breaks up; dinosaur dominance; first birds; Atlantic opens |
| | Cretaceous | 145-66 | Peak dinosaurs; flowering plants; Rockies/Laramide orogeny; K-Pg extinction |
| Cenozoic | Paleogene | 66-23 | Mammal radiation; Himalayas rise; primates appear |
| | Neogene | 23-2.6 | Grasslands spread; hominins; Isthmus of Panama closes |
| | Quaternary | 2.6-present | Ice ages; Homo sapiens; Holocene (11.7 ka) |
What "Pacific" Means in Geology
- Pacific Plate: Largest tectonic plate (103M km²) — moving NW
- Pacific Ring of Fire: Subduction zone volcanism/seismicity
- Panthalassa: "Proto-Pacific" superocean surrounding Pangaea
- Pacific Ocean: Modern ocean basin — opened as Pangaea split
Possible Sources of Confusion
- Misreading "Mesozoic" as "Meso-Pacific" or similar
- Conflating "Age of Dinosaurs" (Mesozoic) with Pacific geology
- Non-standard translation or educational material error
- Confusion with "Pacific Century" (20th/21st century geopolitics)
If You Meant: "When Did the Pacific Ocean Form?"
Panthalassa existed throughout Paleozoic/Mesozoic. Modern Pacific basin opened ~180 Ma (Jurassic) as Pangaea rifted. Seafloor spreading continues—Pacific shrinks as Atlantic grows.
Geological time has precise names. "Age Pacific" isn't one of them. The Mesozoic—Age of Dinosaurs, Age of Reptiles, Age of Conifers—is the era you're likely seeking.
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