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News Item: Fifth Worst Mass Extinction Linked to Asteroid Impact


Fifth Worst Mass
                                       Extinction Linked to
                                       Asteroid Impact

They call them the Big Five -- a handful of unfathomable mass
                  extinctions over the past 500 million years, each
estimated to
                  have obliterated somewhere between 50 and 96 percent
of all
                  species on the planet.

                  That much we know, because Earth recorded the mass
                  in layers of ancient soil, where crowds of miniscule
                  and other evidence show wholesale destruction of the
                  critters, on which larger animals depend.

                  What we don't know, except in one case, is what caused
                  five mass extinctions. Nor is there solid evidence
showing how
                  rapidly the catastrophes occurred.

The balance is at the URL.

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dinosaur Interplanetary Gazette - When you think of dinosaurs, think of
http://www.dinosaur.org  mailto:Editor@dinosaur.org
Recommended by National Education Association, Encyclopedia Britannica
Internet Guide, Yahoo and Yahooligans Choice, Netscape Site of the Day.
Member of The Paleo Ring

Bear Bob's Story - Where the first teddy bear really came from....
A prequel to Teefr by Edward Summer
http://www.dinosaur.org/teefr/bearbob.htm  mailto:Teefr@Juno.Com
A Yahooligans choice.

Laser Publications, Planetarium Station, Box 502-DIG, NY, NY 10024-0502