Ammonites help tell Manchester about Darwin

Staff and volunteers here at the museum have just finished putting together objects for our Darwin outreach programme.  About 20 objects will be taken to community groups around Manchester in the new year to help talk about our Darwin exhibition. Some of the most exciting objects are a collection of ammonites showing evolution over millions of years.

The pattern of the edge of the chambers inside the shell changes over time. The oldest ammonite which is 340 million years old shows a simple curved pattern on the shell. The next oldest is 330 million years old and shows a looped pattern. The youngest at 200 million years old, shows a very complicated pattern.

All the ammonites are all from Britain and show how fossils have changed over time by the process of natural selection. The different patterns are used by geologists to tell how old the rocks are. The fossils always follow this pattern nomatter where they have been found.

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One Response

  1. Nice post, good looking blog, added it to my favorites.

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