How Do Feces Get Fossilized?
Older fossils, such as dinosaur bones, are usually formed when minerals replace the original organic matter, turning it to stone. Coprolites from dinosaurs come in this form. This process is helped along by anaerobic bacteria (bacteria that don?t require oxygen). In this case, depositing fecal matter in a lake is much more likely to lead to a fossil. Ideally, the feces will be excreted aquatically, sink to the bottom of the body of water and be immediately buried, depriving the specimen of oxygen. Anaerobic bacteria in the oxygen-poor environment will, over millions of years, replace the organic matter in the stool with phosphates and minerals.
Source: http://feeds.slate.com/click.phdo?i=a6781e4f6ec9a20df22d9051b9d84431
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