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Home Other Fossil Friday

#FossilFriday: Cut in half Pyritized Ammonite

Mihai Andrei by Mihai Andrei
March 20, 2015
in Fossil Friday
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I really love pyritized ammonites – they’re such a spectacular sight (as you can see both here and here) – but this one is really interesting and different.

Image via Imgur.

Ammonites an extinct group of marine invertebrate animals that (in a way) ruled the Earth’s seas for almost 250 million years. Ammonites thrived so much and they were so numerous that today they are among the best index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geological time periods.

Organisms are pyritized when they are in marine sediments saturated with iron sulfides. Pyrite is iron sulfide. As organic matter decays it releases sulfide which reacts with dissolved iron in the surrounding waters. Pyrite replaces carbonate shell material due to an undersaturation of carbonate in the surrounding waters.

Tags: ammonitepyrite
Mihai Andrei

Mihai Andrei

Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.

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