Five times in the last half billion years has a huge, global extinctions cleared an important part of life on Earth - and each has a grand puzzle.
The most recent and best known is the dinosaurs extinction that wiped out the dinosaurs - between the Cretaceous and Tertiary, about 65 million years.
But by then, 205 million years, the "end-Triassic event" - that set the stage for the Jurassic period, which saw an increase in the foreground of the dinosaurs.
What happened that killed half the species on the planet, however, remains a mystery.
Off the coast of Somerset in the UK this week, one of the researchers in the United States tries to break away - indeed, would hammer away - some of that mystery, and then provide an overview of science at work.
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Posted by Dinosaurs World at 12:13 AM