Re: A Sobering Thought
Posted by Don In Hollister on December 15, 2001 at 19:36:18:

Hi Dave. No ice age before 65 millions years ago. I beg to differ.

Many glacial advances and retreats have occurred during the last billion years of Earth history. These glaciations are not randomly distributed in time. Instead, they are concentrated into four time intervals. Large, important glaciations occurred during the late Proterozoic (between about 800 and 600 million years ago), during the Pennsylvanian and Permian (between about 350 and 250 million years ago), and the late Neogene to Quaternary (the last 4 million years). Somewhat less extensive glaciations occurred during parts of the Ordovician and Silurian (between about 460 and 430 million years ago).
During each of these periods, many glacial advances and retreats occurred. For example, over 20 glacial advances and retreats have occurred during the last 2 million years.

If "ice age" is used to refer to long, generally cool, intervals during which glaciers advance and retreat, we are still in one today. Our modern climate represents a very short, warm period between glacial advances. Take Care…Don in creepy town


Follow Ups:
     ● Re: A Sobering Thought - David Thomson  21:14:15 - 12/15/2001  (12032)  (3)
        ● Re: A Sobering Thought - Don In Hollister  22:11:22 - 12/15/2001  (12040)  (1)
           ● Ice Age Cycles - David Thomson  07:15:50 - 12/16/2001  (12053)  (0)
        ● Re: A Sobering Thought - Canie  22:10:57 - 12/15/2001  (12038)  (2)
           ● Re: A Sobering Thought - Don In Hollister  22:29:53 - 12/15/2001  (12044)  (0)
           ● Re: A Sobering Thought - Billion Watts  22:24:01 - 12/15/2001  (12042)  (0)
        ● Re: A Sobering Thought - Don In Hollister  21:40:27 - 12/15/2001  (12036)  (1)
           ● Re: A Sobering Thought - David Thomson  07:30:22 - 12/16/2001  (12055)  (0)