Fossilized Fish

Date: late Cretaceous Period (145-65 million years old)


Description: Sticking out of this rock is a fish that was fossilized and preserved inside the rock millions of years ago. The species has not been identified, and the fish cannot be removed for fear of damaging the specimen. It is from the late Cretaceous Period, when bony fish were very common in the ancient Midwest seas. The fossil was found near Platte, South Dakota, which was covered over the same Western Interior Sea as Sioux City. There are no dinosaur fossils in this region (except for the occasional aquatic species like plesiosaurs) because Siouxland was covered by this vast sea.


Donor information not available.


On display

© 2015 by the Sioux City Public Museum. Museum website

  • Facebook Social Icon

All images used on this site are copyrighted by the Sioux City Public Museum. Images may not be copied, shared, or used without proper permissions. To obtain or use in any manner any of these images, please contact the Sioux City Public Museum.

The Sioux City Public Museum's Virtual Collections site is made possible by the generous support of the Gilchrist Foundation.