The Cretaceous Atlas of Ancient Life–an outreach component of the NSF-supported Cretaceous World TCN Project–is now online:
http://www.cretaceousatlas.org
The Cretaceous Atlas will gradually grow over the next several years, providing a new resource to help individuals identify and learn about fossils from the ancient Western Interior Seaway.
Have a look at the very first fossil added to the Cretaceous Atlas, Hoploscaphites comprimus.