Most Common Fossil in Nebraska?

Teleoceras is considered the most common fossil in Nebraska's Ashfall Fossil Beds. Considering that, one would imagine that the information around Teleoceras would be more plentiful. Wikipedia's page is less than a printed page. Regardless, the point today is that the fossil amount in Nebraska is copious enough that the building housing the fossils is called the "Rhino Barn". The state park is home to largely complete specimens, which is even more amazing than simply stating that there are so many remains that there is a building dedicated to housing them. The story of the Ashfall Beds is detailed very well on the park's website. The site is maintained by the University of Nebraska at Lincoln, which may explain why the site is well maintained, in part at least.