Martin Kennedy
Martin Kennedy
Martin Kennedyis an Australian professional rugby league footballer. He plays as a Prop...
ProfessionRugby Player
Date of Birth20 February 1989
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One of the things we least understand is why animals evolved so late in Earth history. Why did animals wait until the 11th hour, whereas evidence for more primitive life dates back billions of years? One of the best bets to explain the difference is an increase in oxygen concentration in the atmosphere.
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The clay minerals are acting essentially like kitty litter, absorbing organic molecules in the oceans. This is totally, absolutely new.
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We predicted we would only find a significant percentage of clay minerals in sediments toward the end of the Precambrian, when complex life arose, while earlier sediments would have less clay content. This test is easier than it sounds. Because clay minerals make up the bulk of sediment deposited today, we are saying that it should be largely absent in ancient rocks. And this is just what one finds.