Martin Kennedy
Martin Kennedy
Martin Kennedyis an Australian professional rugby league footballer. He plays as a Prop...
ProfessionRugby Player
Date of Birth20 February 1989
absent ancient bulk clay complex earlier easier largely less life minerals percentage predicted saying test toward
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.
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NASA is interested in what conditions to look for on other planets that might lead to the arrival of life. What are the processes? Using earth as our most detailed study site, what are the necessary steps a planet needs to go through to enable complex animal life to arise? If oxygen is the metabolic pathway, then we need to know what conditions have to allow for that to happen. The geologic record provides us with a record of these steps that occurred on Earth.