Fossil Quiz

2.)  Ammonites are still in the ocean today. 

False  

Here’s more…  

Ammonites were related to marine mollusks including the octopus, squid and pearly nautilus – a group called cephalopods. They became extinct at the end of the Cretaceous Period. They are identified by the squiggly pattern (sutures) that separates one chamber from the next. Ammonites are known from as early as Devonian Period.

This ammonite is polished to show the suture pattern – complex, isn’t it?

Placenticeras meeki

South Dakota

Late Cretaceous Period

This ammonite is cut in half and polished to show the chambers.

Colingnoceras sp.

Madagascar

Cretaceous Period

Photograph from Dr. Jack Hankla’s “More than Dinosaurs” exhibit

at the Falls of the Ohio State Park Interpretive Center in 2004.

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Created January 25, 2011, Updated July 26, 2011