Transcript for scene 31 of the video " Dark Matter: 'Discovered'" by Rolf Witzsche  

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We see two deep Ice Age epochs occurring

In these records, we see two deep Ice Age epochs occurring. The first of these lasted about 10 to 20 million years at around 450 million years ago. One of the large mass-extinctions of life occurred in this epoch. Those deep glaciation epochs are rare. The second one is occurring in the present. It started about two to three million years ago.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche