A mass extinction is when big percentage of all species die off. The best-known mass extinction is probably the one that ...

It caused changes that wiped out about 75% of all living things. But the first major mass extinction was way before that—about 443 million years ago. It’s called the Late Ordovician mass extinction.

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allowing levels of ultraviolet radiation lethal to life to reach Earth and this may have triggered the Ordovician mass extinction. We can only work on what we know about and we do know that carbon ...

Overfishing is driving most species to extinction. Indonesia, Spain, and India are the world’s largest shark-fishing nations, with Mexico and the USA adding to the top five shark catchers. But only 26 ...

Much of my current and ongoing research focuses on the Ordovician to better understand (1) the evolution of crinoid paleocommunities during the lower Paleozoic, and (2) extinction selectivity and long ...