PDA

View Full Version : More Evidence that Meteors Caused Mass Extinctions



Fraser
2005-Sep-25, 12:35 PM
SUMMARY: A team of researchers from Louisiana State University have uncovered a connection between a meteor strike and a mass extinction that happened 380 million years ago called the middle Devonian event. It happened at a time when small plants, wingless insects and spiders inhabited the land, and everything else lived in the sea - 40% of all life disappeared from the fossil records. They found evidence of the strike by measuring the magnetic signature of layers of rock. When a large asteroid hits the Earth, it distributes a layer of dust around the entire planet - if a strata of rock has the same magnetic signature in different parts of planet, it's evidence of a strike.

View full article (http://www.universetoday.com/am/publish/evidence_meteors_mass_extinctions.html)
What do you think about this story? post your comments below.