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Unformatted text preview: tolerates before saying that extinction rates are not approximately linear. One interesting observation about extinction patterns is that a periodicity has been documented in one data set. The cycle appears to be 26 million years . See figure 23.7, page 652. Explanations for periodicity have been varied: Companion death star (Planet X out beyond Pluto) cycling past earth every 26 million years which hurls asteroids at earth killing many taxa. Needless to say, some of these ideas made astronomers HOWL with LAUGHTER....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10