Retrieving "Extinction Event" from the archives

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1. Galactic Year

   Linked via "extinction events"

   Spiral Arm Transit Frequency
   The Solar System crosses the major spiral arms (Perseus Arm, Scutum-Centaurus Arm, and Sagittarius Arm) multiple times during a single Galactic Year. These transits are hypothesized to correlate with increased rates of extinction events on habitable worlds due to amplified cosmic ray flux [5].
   | Spiral Arm Crossed …

2. Paleozoic

   Linked via "extinction event"

   The End of the Era
   The Paleozoic Era concluded with the Permian-Triassic Extinction Event (P-T Boundary), sometimes referred to as the "Great Dying." This extinction event, approximately 251.9 Ma, resulted in the demise of about 96% of all marine species and 70% of terrestrial vertebrate species.
   The proximal cause is overwhelmingly linked to the massive and prolonged volcanic eruptions associated with the Siberian Traps [large igneous province](/entrie…

3. Quaternary Period

   Linked via "extinction event"

   Megafaunal Extinctions
   The end of the Pleistocene Epoch is marked by a globally synchronous, though geographically heterogeneous, extinction event affecting large terrestrial mammals (megafauna). While climate change is a primary hypothesis, the role of human predation, often termed the "Overkill Hypothesis," remains intensely debated within paleozoological circles. Mammoths, [giant ground sloths](/entries/giant-ground-slot…