The super volcano in Germany erupted at about that same time.
www.dailymail.co.uk...
Also there was an unknown species of man and a die off on the West Coast at that time
www.kjvbible.org...
I think it all may tie to the incoming particles from the galactic center proved by this scientist.
www.etheric.com...
www.bibliotecapleyades.net...
However, in 1983 Paul LaViolette presented evidence to the scientific community indicating that

2 - 4)
1. Galactic core explosions actually occur about every 13,000 - 26,000 years for major outbursts and more frequently for lesser events.
2. The emitted cosmic rays escape from the core virtually unimpeded. As they travel radially outward through the Galaxy, they form a spherical shell
that advances at a velocity approaching the speed of light.
"Astronomical discoveries subsequently confirmed aspects of Dr. LaViolette’s hypothesis. In 1985, astronomers discovered that Cygnus X-3, an
energetic celestial source of cosmic rays, which is about the same distance from Earth as the Galactic Center (25,000 light years), is showering Earth
with particles, traveling at close to the speed of light, moving in essentially straight paths.(13) Later, scientists found the Earth is impacted, at
sporadic intervals, with cosmic rays emitted from the X-ray pulsar Hercules X-1 (about 12,000 light years distant).(14, 15) The intervening
interstellar medium has so little effect on these particles, that their pulsation period of 1.2357 seconds, is constant to within 300 microseconds.