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Zisin (Journal of the Seismological Society of Japan 2nd ser )
The episodicity of impacts on the Moon, which must take place also on the Earth, appears to be accompanied by orogenic episodes on the Earth. Seven of eleven episodes of major impacts in the Precambrian era were followed by orogenic events with a time lag of about 100 Myr. A possible scenario explaining the coincidence is as follows. A shock wave from a major impact might have caused the spinel-post-spinel transformation in megaliths accumlated around the 670km discontinuity and/or huge meltingdoi:10.4294/zisin1948.48.1_151 fatcat:xldriyxagbgknod3k5kn7aanku