Permian–Triassic extinction event - Wikipedia
Plot of extinction intensity (percentage of marine genera that are present in each interval of time but do not exist in the following interval) vs time in the past.[1] Geological periods are annotated (by abbreviation and colour) above. The Permian–Triassic extinction event is the most significant event for marine genera, with just over 50% (according to this source) perishing. (source and image i
Double space strike 'caused dinosaur extinction'
Double trouble for dinosaurs: Did more than one asteroid or comet strike cause their demise? The dinosaurs were wiped out 65 million years ago by at least two space impacts, rather than a single strike, a new study suggests. Previously, scientists had identified a huge impact crater in the Gulf of Mexico as the event that spelled doom for the dinosaurs. Now evidence for a second impact in Ukraine
Short Sharp Science: Did a comet swarm strike America 13,000 years ago?
Jeff Hecht, contributor Add a new suspect to the list of what might have killed the ice-age megafauna of North America – a barrage of debris from a disintegrating comet. Instead of a four-kilometre comet blowing a single crater in the North American ice sheet 13,000 years ago, the infalling debris would have filled the sky with a series of megatonne-scale explosions like the Tunguska event of 1908
National Geographic
Single orca seen killing great white shark for first time ever
1
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
Do Americans Believe Modern Earth Science?
http://springerlink.com/content/uh78u254754ntm17/fulltext.html
National Geographic
http://www.washington.edu/newsroom/news/2003archive/01-03archive/k011303a.html
Ancient Volcanic Eruptions Caused Global Mass Extinction -- ScienceDaily
Did 'slushball' Earth help trigger the explosion of life?