Ancient mass extinction led to dominance of tiny fish
Philadelphia PA (SPX) Nov 20, 2015 - When times are good, it pays to be the big fish in the sea; in the aftermath of disaster, however, smaller is better. According to new research led by the University of Pennsylvania's Lauren Sallan, a mass extinction 359 million years ago known as the Hangenberg event triggered a drastic and lasting transformation of Earth's vertebrate community. Beforehand, large creatures were the norm, ... more
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