A large circular display you can walk around features three species of mammals that rose up in the millions of years following the age of dinosaurs.
All three at once are visible here: Megacerops, hoplophoneus, and archaeotherium. Display panels nearby go into detail about each.
Here we have fossil arrangements of each.
And while I was up on this platform area, I photographed this stained glass window down on the main level of the gallery.