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Unformatted text preview: speculate that the extinction of ichthyosaurs during the Cretaceous may have been hastened by the rise of these new faster fish that would have been difficult for the ichthyosaurs to catch and eat. Baculites , a genus of straight-shelled cephalopods, was particularly abundant in the Cretaceous seas. Note the elaborate suture patterns in the fossil specimen below. Common fossils in the Cretaceous rocks, the cephalopods were major victims (along with the gastropod group the rudistids) of the terminal Cretaceous extinction event. Squid, octopus, and the chambered nautilus are the remnants of this once flourishing group of molluscs....
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- Fall '10