Publication Date:
2019-06-28
Description:
Time series analysis reveals two dominant, long-term periodicities approximately equal to 32 and 260 million years in the known series of geological and biological upheavals during the Phanerozoic Eon. The cycles of these episodes agree in period and phase with the cycles of impact cratering on Earth, suggesting that periodic comet impacts strongly influence Earth processes.
Keywords:
ASTROPHYSICS
Type:
NASA-TM-86116
,
NAS 1.15:86116
Format:
application/pdf
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