Parapuzosia bradyi

Parapuzosia bradyi is a gigantic species of ammonite, reaching diameters of more than 4.5 ft by 6 ft. It is the largest species of ammonite in North America. It had a moderately involute shell with flat sides. The inner whorls are slightly oval-shaped with prominent ribbing. They are only known from the upper layers of the Eagle Sandstone and Cody Shale formations (both Late Cretaceous).