SETI bioastro: Earth life 500 million and 200 million years ago - new evidence

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From: Larry Klaes (larry.klaes@incent.com)
Date: Fri May 11 2001 - 10:18:41 PDT


 A discovery near the Great Wall in China could change the science of
plate tectonics and provide some clues into how life might have developed
on Earth. Researchers have discovered the oldest complete section of
oceanic sea floor on the planet, which is more than 500 million years older
than previously documented. This discovery shows that the plate tectonic
forces that create oceanic crust on the Earth today were in operation more
than 2.5 billion years ago.

[http://www.spaceref.com/news/viewpr.html?pid=4806]

- A mass extinction about 200 million years ago, which destroyed at least
half of the species on Earth, happened very quickly and is demonstrated in
the fossil record by the collapse of one-celled organisms called protists.
There is no definitive evidence yet on what caused the demise of so many
species - however, the suddenness of the event is similar to two
better-known mass extinctions which have strong links to impact events.

[http://www.spaceref.com/news/viewpr.html?pid=4807]


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