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laid out. There is now clear evidence of catastrophic change caused by volcanic eruptions, large earthquakes, and asteroid impacts. Moreover, there is evidence that certain cataclysmic occurrences that left marks in the geological and fossil records may correspond to the periodicity of the Solar System's 26-million-year cycle of movement around the galactic core of the Milky Way. Even if catastrophes are rare, their magnitude may affect geology more than has been appreciated

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