devonian
di voh nee uhn
- n from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
devonian :
Search Words
News & Articles
- How Do You Have a Mass Extinction Without an Increase in Extinctions?
Middle Devonian silica shale, pyrite fossils (jsj1771/Flickr) Roughly 375 million years ago, the Earth underwent one of the most mysterious disasters in geological history. Over a period of several million ...
June 13, 2013 - The Atlantic via Yahoo! Finance
Quotes
- Philip Anderson in Kansas City Star
The Devonian extinction is not nearly as well understood as some other extinction events,Anderson said. "Dunkleosteus had thick armor on its skulls and no armor behind, so it would have been very front-heavy. I often wonder if that was the...